SlideShare une entreprise Scribd logo
1  sur  30
SPECTACLE FOR COMPUTER USE
WHY DO
    COMPUTERS CAUSE EYE STRAIN ?
• Accommodation:
  Computer use requires
  focusing & refocusing and
  eye alignment at 45-75 cm
  for long time

• Vergence: When viewing computer screen,
  eyes become locked in this close range,
  increasing near-sightness or myopia

• Dry eye: With sustained fixation, the eyes
  do not blink enough, so they dry out
EYE STRAIN DUE TO
                WRONG MONITOR SETTING

  FOLLOWING MONITOR SETTING
  AFFECT EYES
• REFRESH RATE refers to how often your monitor
  redraws the content on the screen              70 hertz
  or higher is better
• RESOLUTION refers to monitor's pixel density
• The more pixels, the higher the level of detail and less
  eye strain
• DOT PITCH affects the sharpness of the display
  Lower the number, the sharper the image
  0.28 or lower is desirable
THE MONITOR VS. PRINTED PAGE

THE SIGNAL FROM THE
MONITOR IS NOT AS GOOD
AS THE PRINTED PAGE

• A monitor is a dynamic signal, in that screen is
  constantly being redrawn
• A monitor creates images on the basis of varying
  light intensity through a fixed set of red, green and
  blue points. This results in less distinct edges, and
  lower contrast
• The illumination of points on a monitor is not sharp,
  but is somewhat rounded.
COMPUTER VISION SYNDROME (CVS)
                   TYPICAL SYMPTOMS

•   Fatigue
•   Eyestrain
•   Headaches
•   Slow focusing
•   Tired, burning eyes
•   Neck and shoulder pain
    – Frequent bending forward & backward
• Blurred vision at distance
9    STEPS TO REDUCE           CVS

1.   Get a computer eye exam
2.   Use proper lighting
3.   Minimize glare
4.   Blink more often
5.   Take frequent breaks
6.   Exercise and stretch your eyes
7.   Adjust the settings of your computer screen
8.   Modify your workstation
9.   Use separate eye ware for computer use
AVAILABLE
           CORRECTIVE METHODS

1. FULL VISION READING GLASS
2. HALF EYE READING GLASS
3. TWO SEPARATE SPECTACLE
4. BI-FOCAL SPECTACLE
5. TRI-FOCAL SPECTACLE
6. REGULAR PROGRESSIVE LENSES
AVAILABLE CORRECTIVE METHODS
           1. Full vision reading glass
         Full vision reading glass




•   Clear near vision
•   Distance blur
•   Move close to monitor to see clearly.
•   Need Tint and ARC
•   Creating neck & back pain and CVS
AVAILABLE CORRECTIVE METHODS
                  2. Half eye reading glass
     Half eye reading glass




•   Clear near vision
•   Distance blur
•   Must lower heads to an unnatural 15- 45° tilt
•   Suitable for patients, just becoming presbyopic
•   Creating neck & back pain and CVS
AVAILABLE CORRECTIVE METHODS
           3. Two separate spectacle




•   Clear near vision with reading glass
•   Clear distance vision with second glass
•   No Intermediate vision
•   In-convenient in keeping two spectacle
AVAILABLE CORRECTIVE METHODS
                  4. Bi-focal spectacle




•   The segment may be too low and set for 30cm
•   Near vision through lower lens area
•   Lift their heads by 25°
•   Visible bi-focal line
•   Strain in neck and shoulder muscles
AVAILABLE CORRECTIVE METHODS
                     5. Tri-focal spectacle
                        Tri-focal



         Intermediate vision


•   Top of the glasses are for distance
•   Intermediate area for the computer use
•   Bottom segment for reading and keyboard
•   Visible tri-focal lines
•   Inconvenient and Outdated
AVAILABLE CORRECTIVE METHODS
     6. Regular progressive lenses




•   Multi focal / Graduated power Design
•   Lift their heads 25°
•   The reading area may not be high enough
•   Intermediate channel is not wide enough
    – (Hour Glass)
• Outside of channel are distorted
WHAT ARE
           COMPUTER EYE WARE ?

• They are different from usual glasses
• They need special prescription
• Using different lens design
• Special lens treatments
• Optimum visual comfort and work
  efficiency
• Ideal solution for CVS
WHO NEED
             COMPUTER EYE WARE ?
INDIVIDUALS WITH THE FOLLOWING
DIAGNOSED CONDITIONS OFTEN REQUIRE
COMPUTER GLASSES
•   PRESBYOPIA
•   HYPEROPIA
•   MYOPIA
•   ASTIGMATISM
•   HETEROPHORIA
•   DRY EYE
•   CONVERGENCE INSUFFICIENCY
•   DISORDERS OF ACCOMMODATION
COMPUTER EYE WARE
             DIAGNOSTIC INSTRUMENTS
This System simulates the real
  characteristics of computer
  screen in the doctor's clinic
  and cause eyes to react the
  same way as they do when
  you sit in front of computer
  in your office

This allows the doctor to
  determine the exact
  correction and prescribe
  suitable computer eye ware

E.g.. PRIO Diagnostic System
SIGNIFICANCE OF LENS MATERIAL
                           IN COMPUTER EYE WARE
• CROWN GLASS:
   – Best optics and scratch resistant
   – Heavy and not safe, therefore not used very much
• CR - 39: Standard plastic, excellent optics
   – Good for small and medium prescriptions
• POLYCARBONATE :
   – Thin, light and strong - Safest lens
• HIGH INDEX :
   – Good for higher prescriptions
   – Need Scratch resistant and Anti-reflective coatings
• PHOTOCHROMIC:
   – No significance in computer eye ware
SIGNIFICANCE OF LENS COATING
                      IN COMPUTER EYE WARE

• ULTRA-VIOLET (UV) COATING:
   – Monitors do not emit UV light
   – So computer eye ware do not need UV coatings
• ANTI-REFLECTIVE COATINGS (ARC):
   – Reduce reflection and back glare
   – Available in gold, green and blue color
• SCRATCH RESISTANT COATINGS (SRC):
   – This clear coating hardens to provide a durable,
     tougher lens
   – Scratch resistance does not mean scratch proof
SIGNIFICANCE OF TINTING
                      IN COMPUTER EYE WARE

• THE TINTING:
   – Recommended for working in a bright lit office
   – This can cut the amount of light that reaches
     your eyes and provide relief
   – But tints and filters don't address the underlying
     cause of computer eyestrain
   – Example: Melanin tint
• POLARIZATION:
   – These lenses provide excellent clarity and
     maximize visual acuity by minimizing glare
SPECTACLES
                FOR COMPUTER USE


1. NORMAL VISION SPECTACLE
2. COMPUTER READING GLASSES
3. OCCUPATIONAL PROGRESSIVE
   LENSES
4. FLIP FOCALS OR CLIP-ON LENSES
5. PIN HOLE SPECTACLE
6. PC MAGNI VIEWER
1. NORMAL VISION SPECTACLE
                   as computer eye ware


• For people
  with normal vision
• Have +0.25 D add power
• Idea is not to add magnification
• But to move focal point closer without using eye
  muscles for accommodation
• Need ARC and tinting
• Rimless frame
• Height only 26 mm to permit viewing “underneath”
  to focus key board etc
2. COMPUTER READING GLASS
                       as computer eye ware



• DESIGNED TO
  SEE AT 45 – 75 CM
• ANTI GLARE COATED & TINTED
• EFFICIENT PROTECTION & REDUCE EYE STRAIN

Normal Reading Glass      Computer Reading Glass
  +0.75 to + 2.00D             + 1.00 D
  +2.00 to + 2.50D             + 1.25 D
  +2.50 to + 3.50D             + 1.50 D
3a. OCCUPATIONAL PROGRESSIVES
                       as computer eye ware

  Occupational Progressive




• Multi-focal aspheric progressive design for
  both near and intermediate vision
• Lower half for near vision correction
• Upper half for mid range vision up to 2.50 M
3b. OCCUPATIONAL PROGRESSIVES
                          as computer eye ware

• Wide intermediate
  area for computer use
• Benefit from a natural
  head and neck position
• Ideal solution for CVS
                                              AVAILABLE
                                               BRANDS:
• Power continuously reduced to:             AO COMPACT
       +0.75 D   for   + 0.75 to + 1.75 NV      Zeiss RD
       +1.25 D   for   + 2.00 to + 3.00 NV   Panorama Mini
                                               ESSILOR
                                              Kodak Precise
4. FLIP FOCAL SPECTACLE
                    as computer eye ware

FLIP FOCALS IS A PAIR OF
CLIP-ON ENHANCEMENTS

•   For Bifocals and progressives
•   Clip – on half frame glasses
•   Focus on monitor 45 – 75 cm from eye
•   Flip down lens for screen viewing
•   Flip up lens for normal viewing (distance)
•   Screen park holder, park on monitor
•   Poly carbonate, simply clip into frames
4. FLIP FOCAL SPECTACLE
                    as computer eye ware




Flip Focals Power calculation
WORKING DISTANCE    CLIP ON        READING GLASS
  30 – 48”          + 1.00 D       +0.75 to +2.00 D
  24 – 42”          + 1.25 D       +2.00 to +2.50 D
  18 – 36”          + 1.50 D       +2.50 to +3.50 D
  - Based on working distance from monitor
  - Approximately half of reading glass power
5. PIN HOLE SPECTACLE
              as computer eye ware




• Low cost
• No glare problem
• Increased depth of field
• The focusing effort or accommodation
  is reduced
• Good solution for CVS
6. PC MAGNI VIEWER
                   as computer eye ware

• Small screens appear much
  larger, sharper and more distant
• Large size and sharpness reduce
  accommodation problems, so
  the eye no longer needs to
  constantly refocus
• Distant-appearing text lets your
  eyes stay parallel, so eye
  muscles relax
• Economically better than buying
  a large monitor
HOW TO CHECK THE QUALITY OF
                   COMPUTER GLASSES ?

• The lenses and its material should be of
  good quality
• There should be no aberrations in the lens
• Lenses must be centered both vertically and
  horizontally in front of the eyes
• There should be no spaces between the
  lenses and frame
• The lenses should be tilted 15 degrees
  towards the cheeks
• The frame should be slight wrapped to
  match the contour of the face
SELECTION & CARE


• Wide choices are available in computer
  eye ware
• Selection depends on occupational
  conditions, taste, and budget of people
• Care must be taken in prescribing the
  power of computer eye ware
• Need special lens design & treatments
• Coating and tinting gives good result
• Ergonomics is also important

Contenu connexe

Tendances

Progressive Adition Lens
Progressive Adition LensProgressive Adition Lens
Progressive Adition LensKewal Hirwani
 
Different types and design of spectacle frames
Different types and design of spectacle framesDifferent types and design of spectacle frames
Different types and design of spectacle framesPabita Dhungel
 
Presbyopic contact lens description
Presbyopic contact lens description Presbyopic contact lens description
Presbyopic contact lens description Ananta poudel
 
Low visual aids
Low visual aidsLow visual aids
Low visual aidsDoc Aaryan
 
Prescribing low vision devices by SURAJ CHHETRI
Prescribing low vision devices by SURAJ CHHETRIPrescribing low vision devices by SURAJ CHHETRI
Prescribing low vision devices by SURAJ CHHETRISuraj Chhetri
 
Pediatric Ophthalmic dispensing in different visual problems
Pediatric Ophthalmic dispensing in different visual problemsPediatric Ophthalmic dispensing in different visual problems
Pediatric Ophthalmic dispensing in different visual problemsRaju Kaiti
 
geneva lens measure/ lens clock
 geneva  lens  measure/ lens clock geneva  lens  measure/ lens clock
geneva lens measure/ lens clockSuraj Shil
 
9 maddox wing test.........arya
9 maddox wing test.........arya9 maddox wing test.........arya
9 maddox wing test.........aryaarya das
 
Frame slection
Frame slectionFrame slection
Frame slectionHira Dahal
 
Presbyopic Contact Lenses: Bifocals and Multifocals
Presbyopic Contact Lenses: Bifocals and MultifocalsPresbyopic Contact Lenses: Bifocals and Multifocals
Presbyopic Contact Lenses: Bifocals and MultifocalsRabindraAdhikary
 
Low vision optical devices
Low vision optical  devicesLow vision optical  devices
Low vision optical devicesRaju Kaiti
 

Tendances (20)

Progressive Adition Lens
Progressive Adition LensProgressive Adition Lens
Progressive Adition Lens
 
Different types and design of spectacle frames
Different types and design of spectacle framesDifferent types and design of spectacle frames
Different types and design of spectacle frames
 
Aspheric lenses
Aspheric lensesAspheric lenses
Aspheric lenses
 
Measuring interpupillary distance
Measuring interpupillary distanceMeasuring interpupillary distance
Measuring interpupillary distance
 
Presbyopic contact lens description
Presbyopic contact lens description Presbyopic contact lens description
Presbyopic contact lens description
 
Low visual aids
Low visual aidsLow visual aids
Low visual aids
 
Prescribing low vision devices by SURAJ CHHETRI
Prescribing low vision devices by SURAJ CHHETRIPrescribing low vision devices by SURAJ CHHETRI
Prescribing low vision devices by SURAJ CHHETRI
 
Polarized lenses
Polarized  lensesPolarized  lenses
Polarized lenses
 
Scleral lenses
Scleral lensesScleral lenses
Scleral lenses
 
Pediatric Ophthalmic dispensing in different visual problems
Pediatric Ophthalmic dispensing in different visual problemsPediatric Ophthalmic dispensing in different visual problems
Pediatric Ophthalmic dispensing in different visual problems
 
Facial measurement
Facial measurementFacial measurement
Facial measurement
 
geneva lens measure/ lens clock
 geneva  lens  measure/ lens clock geneva  lens  measure/ lens clock
geneva lens measure/ lens clock
 
Troubleshooting bifocals
Troubleshooting bifocals Troubleshooting bifocals
Troubleshooting bifocals
 
9 maddox wing test.........arya
9 maddox wing test.........arya9 maddox wing test.........arya
9 maddox wing test.........arya
 
Frame slection
Frame slectionFrame slection
Frame slection
 
Presbyopic Contact Lenses: Bifocals and Multifocals
Presbyopic Contact Lenses: Bifocals and MultifocalsPresbyopic Contact Lenses: Bifocals and Multifocals
Presbyopic Contact Lenses: Bifocals and Multifocals
 
Low vision optical devices
Low vision optical  devicesLow vision optical  devices
Low vision optical devices
 
Toric rgp fit
Toric rgp fitToric rgp fit
Toric rgp fit
 
Rgp lens
Rgp lensRgp lens
Rgp lens
 
Telescopes 3
Telescopes 3Telescopes 3
Telescopes 3
 

En vedette

Low vision in childhood
Low vision in childhoodLow vision in childhood
Low vision in childhoodbkoptom
 
Ophthalmic lens reflections & ARC
Ophthalmic lens reflections & ARCOphthalmic lens reflections & ARC
Ophthalmic lens reflections & ARCVishakh Nair
 
Importance of wearing prescription safety glasses
Importance of wearing prescription safety glassesImportance of wearing prescription safety glasses
Importance of wearing prescription safety glassessuko nugroho
 
Dorso-Lateral Geniculate Nucleus and Parallel Processing
Dorso-Lateral Geniculate Nucleus and Parallel ProcessingDorso-Lateral Geniculate Nucleus and Parallel Processing
Dorso-Lateral Geniculate Nucleus and Parallel ProcessingGauriSShrestha
 
Occupational ocular problems
Occupational ocular problems Occupational ocular problems
Occupational ocular problems sabina paudel
 
Signal Detection Theory
Signal Detection TheorySignal Detection Theory
Signal Detection TheoryGauriSShrestha
 
Progressive addition lens1
Progressive addition lens1Progressive addition lens1
Progressive addition lens1GauriSShrestha
 
Light and dark adaptation
Light and dark adaptationLight and dark adaptation
Light and dark adaptationGauriSShrestha
 
Measurement of corneal curvature
Measurement of corneal curvatureMeasurement of corneal curvature
Measurement of corneal curvatureGauriSShrestha
 
Prism and its properties
Prism and its propertiesPrism and its properties
Prism and its propertiesGauriSShrestha
 
Objective, subjective and cyclopegic refraction
Objective, subjective and cyclopegic refractionObjective, subjective and cyclopegic refraction
Objective, subjective and cyclopegic refractionGauriSShrestha
 
How to protect from sunlight?
How to protect from sunlight?How to protect from sunlight?
How to protect from sunlight?Hossein Mirzaie
 
Eye protection by GCKATS
Eye protection by GCKATSEye protection by GCKATS
Eye protection by GCKATSMikaela Delia
 
Soft Contact Lens Fitting
Soft Contact Lens FittingSoft Contact Lens Fitting
Soft Contact Lens FittingVishakh Nair
 

En vedette (20)

Low vision in childhood
Low vision in childhoodLow vision in childhood
Low vision in childhood
 
Ophthalmic lens reflections & ARC
Ophthalmic lens reflections & ARCOphthalmic lens reflections & ARC
Ophthalmic lens reflections & ARC
 
Importance of wearing prescription safety glasses
Importance of wearing prescription safety glassesImportance of wearing prescription safety glasses
Importance of wearing prescription safety glasses
 
Spectacle intolerance
Spectacle intoleranceSpectacle intolerance
Spectacle intolerance
 
Eye Protection
Eye ProtectionEye Protection
Eye Protection
 
Dorso-Lateral Geniculate Nucleus and Parallel Processing
Dorso-Lateral Geniculate Nucleus and Parallel ProcessingDorso-Lateral Geniculate Nucleus and Parallel Processing
Dorso-Lateral Geniculate Nucleus and Parallel Processing
 
Occupational ocular problems
Occupational ocular problems Occupational ocular problems
Occupational ocular problems
 
Signal Detection Theory
Signal Detection TheorySignal Detection Theory
Signal Detection Theory
 
Progressive addition lens1
Progressive addition lens1Progressive addition lens1
Progressive addition lens1
 
Blepharitis
BlepharitisBlepharitis
Blepharitis
 
Light and dark adaptation
Light and dark adaptationLight and dark adaptation
Light and dark adaptation
 
Measurement of corneal curvature
Measurement of corneal curvatureMeasurement of corneal curvature
Measurement of corneal curvature
 
Prism and its properties
Prism and its propertiesPrism and its properties
Prism and its properties
 
Objective, subjective and cyclopegic refraction
Objective, subjective and cyclopegic refractionObjective, subjective and cyclopegic refraction
Objective, subjective and cyclopegic refraction
 
Occupational optometry
Occupational optometryOccupational optometry
Occupational optometry
 
How to protect from sunlight?
How to protect from sunlight?How to protect from sunlight?
How to protect from sunlight?
 
Healthy Vision in the Workplace by AOA
Healthy Vision in the Workplace by AOAHealthy Vision in the Workplace by AOA
Healthy Vision in the Workplace by AOA
 
Eye protection by GCKATS
Eye protection by GCKATSEye protection by GCKATS
Eye protection by GCKATS
 
Eye Protection by CIH
Eye Protection by CIHEye Protection by CIH
Eye Protection by CIH
 
Soft Contact Lens Fitting
Soft Contact Lens FittingSoft Contact Lens Fitting
Soft Contact Lens Fitting
 

Similaire à Spectacle for computer use

Tools Helping Visual Impairment, Low Vision, and Macular Degeneration
Tools Helping Visual Impairment, Low Vision, and Macular DegenerationTools Helping Visual Impairment, Low Vision, and Macular Degeneration
Tools Helping Visual Impairment, Low Vision, and Macular DegenerationEnhanced Vision
 
Real computer lens design and applications..
Real computer lens design and applications..Real computer lens design and applications..
Real computer lens design and applications..Bipin Koirala
 
Computer vision syndrome document
Computer vision syndrome documentComputer vision syndrome document
Computer vision syndrome documentkelechi ogbonna
 
Magnification in endodontics
Magnification in endodonticsMagnification in endodontics
Magnification in endodonticsKarthik Shetty
 
Low vision aids
Low vision aids Low vision aids
Low vision aids SujanKafle4
 
Digital eye strain
Digital eye strainDigital eye strain
Digital eye strainsafaa refaat
 
Adapting to visual impairment - learning to see through visually impaired eyes
Adapting to visual impairment - learning to see through visually impaired eyesAdapting to visual impairment - learning to see through visually impaired eyes
Adapting to visual impairment - learning to see through visually impaired eyesEnhanced Vision
 
Dispencing optics
Dispencing opticsDispencing optics
Dispencing opticsMahantesh B
 
Clinical Photography in Orthodontics
Clinical Photography in OrthodonticsClinical Photography in Orthodontics
Clinical Photography in OrthodonticsKunaal Agrawal
 
health First Corporate Presentation
health First Corporate Presentationhealth First Corporate Presentation
health First Corporate Presentationhealthfirsthospital
 
Clinical Management of Aphakia and Pseudophakia.pptx
Clinical Management of Aphakia and Pseudophakia.pptxClinical Management of Aphakia and Pseudophakia.pptx
Clinical Management of Aphakia and Pseudophakia.pptxAshi Lakher
 
Pogressive additional lenses
Pogressive additional lensesPogressive additional lenses
Pogressive additional lensesRonak Rajkumar
 
Binocular Indirect Ophthalmoscopy
Binocular Indirect OphthalmoscopyBinocular Indirect Ophthalmoscopy
Binocular Indirect Ophthalmoscopyabhishek ghelani
 

Similaire à Spectacle for computer use (20)

Tools Helping Visual Impairment, Low Vision, and Macular Degeneration
Tools Helping Visual Impairment, Low Vision, and Macular DegenerationTools Helping Visual Impairment, Low Vision, and Macular Degeneration
Tools Helping Visual Impairment, Low Vision, and Macular Degeneration
 
Computer Vision Syndrome
Computer Vision SyndromeComputer Vision Syndrome
Computer Vision Syndrome
 
Real computer lens design and applications..
Real computer lens design and applications..Real computer lens design and applications..
Real computer lens design and applications..
 
Computer vision syndrome document
Computer vision syndrome documentComputer vision syndrome document
Computer vision syndrome document
 
Magnification in endodontics
Magnification in endodonticsMagnification in endodontics
Magnification in endodontics
 
Low vision aids
Low vision aidsLow vision aids
Low vision aids
 
Low vision aids
Low vision aids Low vision aids
Low vision aids
 
Digital eye strain
Digital eye strainDigital eye strain
Digital eye strain
 
Design's of pal's
Design's of pal'sDesign's of pal's
Design's of pal's
 
Adapting to visual impairment - learning to see through visually impaired eyes
Adapting to visual impairment - learning to see through visually impaired eyesAdapting to visual impairment - learning to see through visually impaired eyes
Adapting to visual impairment - learning to see through visually impaired eyes
 
Dispencing optics
Dispencing opticsDispencing optics
Dispencing optics
 
Clinical Photography in Orthodontics
Clinical Photography in OrthodonticsClinical Photography in Orthodontics
Clinical Photography in Orthodontics
 
Computer Vision Syndrome
Computer Vision SyndromeComputer Vision Syndrome
Computer Vision Syndrome
 
Computer Vision Syndrome
Computer Vision Syndrome Computer Vision Syndrome
Computer Vision Syndrome
 
health First Corporate Presentation
health First Corporate Presentationhealth First Corporate Presentation
health First Corporate Presentation
 
Computer Vision Syndrome
Computer Vision SyndromeComputer Vision Syndrome
Computer Vision Syndrome
 
Computer Vision Syndrome
Computer Vision SyndromeComputer Vision Syndrome
Computer Vision Syndrome
 
Clinical Management of Aphakia and Pseudophakia.pptx
Clinical Management of Aphakia and Pseudophakia.pptxClinical Management of Aphakia and Pseudophakia.pptx
Clinical Management of Aphakia and Pseudophakia.pptx
 
Pogressive additional lenses
Pogressive additional lensesPogressive additional lenses
Pogressive additional lenses
 
Binocular Indirect Ophthalmoscopy
Binocular Indirect OphthalmoscopyBinocular Indirect Ophthalmoscopy
Binocular Indirect Ophthalmoscopy
 

Plus de Vishakh Nair

Cornea in Contact Lens wear
Cornea in Contact Lens wearCornea in Contact Lens wear
Cornea in Contact Lens wearVishakh Nair
 
Spectacle Compliance in Primary School Children
Spectacle Compliance in Primary School ChildrenSpectacle Compliance in Primary School Children
Spectacle Compliance in Primary School ChildrenVishakh Nair
 
Awareness of Diabetic Eye Conditions
Awareness of Diabetic Eye Conditions Awareness of Diabetic Eye Conditions
Awareness of Diabetic Eye Conditions Vishakh Nair
 
Peadiatric Eye Conditions
Peadiatric Eye ConditionsPeadiatric Eye Conditions
Peadiatric Eye ConditionsVishakh Nair
 
Bifocal Spectacles..
Bifocal Spectacles..Bifocal Spectacles..
Bifocal Spectacles..Vishakh Nair
 
Progressive Spectacle Lens Fitting
Progressive Spectacle Lens FittingProgressive Spectacle Lens Fitting
Progressive Spectacle Lens FittingVishakh Nair
 
disposable contact lenses
disposable contact lensesdisposable contact lenses
disposable contact lensesVishakh Nair
 
care and maintenance of soft contact lenses
 care and maintenance of soft contact lenses care and maintenance of soft contact lenses
care and maintenance of soft contact lensesVishakh Nair
 

Plus de Vishakh Nair (8)

Cornea in Contact Lens wear
Cornea in Contact Lens wearCornea in Contact Lens wear
Cornea in Contact Lens wear
 
Spectacle Compliance in Primary School Children
Spectacle Compliance in Primary School ChildrenSpectacle Compliance in Primary School Children
Spectacle Compliance in Primary School Children
 
Awareness of Diabetic Eye Conditions
Awareness of Diabetic Eye Conditions Awareness of Diabetic Eye Conditions
Awareness of Diabetic Eye Conditions
 
Peadiatric Eye Conditions
Peadiatric Eye ConditionsPeadiatric Eye Conditions
Peadiatric Eye Conditions
 
Bifocal Spectacles..
Bifocal Spectacles..Bifocal Spectacles..
Bifocal Spectacles..
 
Progressive Spectacle Lens Fitting
Progressive Spectacle Lens FittingProgressive Spectacle Lens Fitting
Progressive Spectacle Lens Fitting
 
disposable contact lenses
disposable contact lensesdisposable contact lenses
disposable contact lenses
 
care and maintenance of soft contact lenses
 care and maintenance of soft contact lenses care and maintenance of soft contact lenses
care and maintenance of soft contact lenses
 

Dernier

Breast cancer -ONCO IN MEDICAL AND SURGICAL NURSING.pptx
Breast cancer -ONCO IN MEDICAL AND SURGICAL NURSING.pptxBreast cancer -ONCO IN MEDICAL AND SURGICAL NURSING.pptx
Breast cancer -ONCO IN MEDICAL AND SURGICAL NURSING.pptxNaveenkumar267201
 
World-TB-Day-2023_Presentation_English.pptx
World-TB-Day-2023_Presentation_English.pptxWorld-TB-Day-2023_Presentation_English.pptx
World-TB-Day-2023_Presentation_English.pptxsumanchaulagain3
 
Generative AI in Health Care a scoping review and a persoanl experience.
Generative AI in Health Care a scoping review and a persoanl experience.Generative AI in Health Care a scoping review and a persoanl experience.
Generative AI in Health Care a scoping review and a persoanl experience.Vaikunthan Rajaratnam
 
Microbiology lecture presentation-1.pptx
Microbiology lecture presentation-1.pptxMicrobiology lecture presentation-1.pptx
Microbiology lecture presentation-1.pptxkitati1
 
blood bank management system project report
blood bank management system project reportblood bank management system project report
blood bank management system project reportNARMADAPETROLEUMGAS
 
Clinical Research Informatics Year-in-Review 2024
Clinical Research Informatics Year-in-Review 2024Clinical Research Informatics Year-in-Review 2024
Clinical Research Informatics Year-in-Review 2024Peter Embi
 
General_Studies_Presentation_Health_and_Wellbeing
General_Studies_Presentation_Health_and_WellbeingGeneral_Studies_Presentation_Health_and_Wellbeing
General_Studies_Presentation_Health_and_WellbeingAnonymous
 
ayurvedic formulations herbal drug technologyppt
ayurvedic formulations herbal drug technologypptayurvedic formulations herbal drug technologyppt
ayurvedic formulations herbal drug technologypptPradnya Wadekar
 
SGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdf
SGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdfSGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdf
SGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdfHongBiThi1
 
Adenomyosis or Fibroid- making right diagnosis
Adenomyosis or Fibroid- making right diagnosisAdenomyosis or Fibroid- making right diagnosis
Adenomyosis or Fibroid- making right diagnosisSujoy Dasgupta
 
MedMatch: Your Health, Our Mission. Pitch deck.
MedMatch: Your Health, Our Mission. Pitch deck.MedMatch: Your Health, Our Mission. Pitch deck.
MedMatch: Your Health, Our Mission. Pitch deck.whalesdesign
 
CONNECTIVE TISSUE (ANATOMY AND PHYSIOLOGY).pdf
CONNECTIVE TISSUE (ANATOMY AND PHYSIOLOGY).pdfCONNECTIVE TISSUE (ANATOMY AND PHYSIOLOGY).pdf
CONNECTIVE TISSUE (ANATOMY AND PHYSIOLOGY).pdfDolisha Warbi
 
"Radical excision of DIE in subferile women with deep infiltrating endometrio...
"Radical excision of DIE in subferile women with deep infiltrating endometrio..."Radical excision of DIE in subferile women with deep infiltrating endometrio...
"Radical excision of DIE in subferile women with deep infiltrating endometrio...Sujoy Dasgupta
 
Good Laboratory Practice (GLP) in Pharma-LikeWays.pptx
Good Laboratory Practice (GLP) in Pharma-LikeWays.pptxGood Laboratory Practice (GLP) in Pharma-LikeWays.pptx
Good Laboratory Practice (GLP) in Pharma-LikeWays.pptxLikeways
 
BENIGN BREAST DISEASE
BENIGN BREAST DISEASE BENIGN BREAST DISEASE
BENIGN BREAST DISEASE Mamatha Lakka
 
QUESTIONS & ANSWERS FOR QUALITY ASSURANCE, RADIATIONBIOLOGY& RADIATION HAZARD...
QUESTIONS & ANSWERS FOR QUALITY ASSURANCE, RADIATIONBIOLOGY& RADIATION HAZARD...QUESTIONS & ANSWERS FOR QUALITY ASSURANCE, RADIATIONBIOLOGY& RADIATION HAZARD...
QUESTIONS & ANSWERS FOR QUALITY ASSURANCE, RADIATIONBIOLOGY& RADIATION HAZARD...Ganesan Yogananthem
 
Unit I herbs as raw materials, biodynamic agriculture.ppt
Unit I herbs as raw materials, biodynamic agriculture.pptUnit I herbs as raw materials, biodynamic agriculture.ppt
Unit I herbs as raw materials, biodynamic agriculture.pptPradnya Wadekar
 
FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...
FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...
FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...Shubhanshu Gaurav
 
High-Performance Thin-Layer Chromatography (HPTLC)
High-Performance Thin-Layer Chromatography (HPTLC)High-Performance Thin-Layer Chromatography (HPTLC)
High-Performance Thin-Layer Chromatography (HPTLC)kishan singh tomar
 
power point presentation of Clinical evaluation of strabismus
power point presentation of Clinical evaluation  of strabismuspower point presentation of Clinical evaluation  of strabismus
power point presentation of Clinical evaluation of strabismusChandrasekar Reddy
 

Dernier (20)

Breast cancer -ONCO IN MEDICAL AND SURGICAL NURSING.pptx
Breast cancer -ONCO IN MEDICAL AND SURGICAL NURSING.pptxBreast cancer -ONCO IN MEDICAL AND SURGICAL NURSING.pptx
Breast cancer -ONCO IN MEDICAL AND SURGICAL NURSING.pptx
 
World-TB-Day-2023_Presentation_English.pptx
World-TB-Day-2023_Presentation_English.pptxWorld-TB-Day-2023_Presentation_English.pptx
World-TB-Day-2023_Presentation_English.pptx
 
Generative AI in Health Care a scoping review and a persoanl experience.
Generative AI in Health Care a scoping review and a persoanl experience.Generative AI in Health Care a scoping review and a persoanl experience.
Generative AI in Health Care a scoping review and a persoanl experience.
 
Microbiology lecture presentation-1.pptx
Microbiology lecture presentation-1.pptxMicrobiology lecture presentation-1.pptx
Microbiology lecture presentation-1.pptx
 
blood bank management system project report
blood bank management system project reportblood bank management system project report
blood bank management system project report
 
Clinical Research Informatics Year-in-Review 2024
Clinical Research Informatics Year-in-Review 2024Clinical Research Informatics Year-in-Review 2024
Clinical Research Informatics Year-in-Review 2024
 
General_Studies_Presentation_Health_and_Wellbeing
General_Studies_Presentation_Health_and_WellbeingGeneral_Studies_Presentation_Health_and_Wellbeing
General_Studies_Presentation_Health_and_Wellbeing
 
ayurvedic formulations herbal drug technologyppt
ayurvedic formulations herbal drug technologypptayurvedic formulations herbal drug technologyppt
ayurvedic formulations herbal drug technologyppt
 
SGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdf
SGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdfSGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdf
SGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdf
 
Adenomyosis or Fibroid- making right diagnosis
Adenomyosis or Fibroid- making right diagnosisAdenomyosis or Fibroid- making right diagnosis
Adenomyosis or Fibroid- making right diagnosis
 
MedMatch: Your Health, Our Mission. Pitch deck.
MedMatch: Your Health, Our Mission. Pitch deck.MedMatch: Your Health, Our Mission. Pitch deck.
MedMatch: Your Health, Our Mission. Pitch deck.
 
CONNECTIVE TISSUE (ANATOMY AND PHYSIOLOGY).pdf
CONNECTIVE TISSUE (ANATOMY AND PHYSIOLOGY).pdfCONNECTIVE TISSUE (ANATOMY AND PHYSIOLOGY).pdf
CONNECTIVE TISSUE (ANATOMY AND PHYSIOLOGY).pdf
 
"Radical excision of DIE in subferile women with deep infiltrating endometrio...
"Radical excision of DIE in subferile women with deep infiltrating endometrio..."Radical excision of DIE in subferile women with deep infiltrating endometrio...
"Radical excision of DIE in subferile women with deep infiltrating endometrio...
 
Good Laboratory Practice (GLP) in Pharma-LikeWays.pptx
Good Laboratory Practice (GLP) in Pharma-LikeWays.pptxGood Laboratory Practice (GLP) in Pharma-LikeWays.pptx
Good Laboratory Practice (GLP) in Pharma-LikeWays.pptx
 
BENIGN BREAST DISEASE
BENIGN BREAST DISEASE BENIGN BREAST DISEASE
BENIGN BREAST DISEASE
 
QUESTIONS & ANSWERS FOR QUALITY ASSURANCE, RADIATIONBIOLOGY& RADIATION HAZARD...
QUESTIONS & ANSWERS FOR QUALITY ASSURANCE, RADIATIONBIOLOGY& RADIATION HAZARD...QUESTIONS & ANSWERS FOR QUALITY ASSURANCE, RADIATIONBIOLOGY& RADIATION HAZARD...
QUESTIONS & ANSWERS FOR QUALITY ASSURANCE, RADIATIONBIOLOGY& RADIATION HAZARD...
 
Unit I herbs as raw materials, biodynamic agriculture.ppt
Unit I herbs as raw materials, biodynamic agriculture.pptUnit I herbs as raw materials, biodynamic agriculture.ppt
Unit I herbs as raw materials, biodynamic agriculture.ppt
 
FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...
FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...
FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...
 
High-Performance Thin-Layer Chromatography (HPTLC)
High-Performance Thin-Layer Chromatography (HPTLC)High-Performance Thin-Layer Chromatography (HPTLC)
High-Performance Thin-Layer Chromatography (HPTLC)
 
power point presentation of Clinical evaluation of strabismus
power point presentation of Clinical evaluation  of strabismuspower point presentation of Clinical evaluation  of strabismus
power point presentation of Clinical evaluation of strabismus
 

Spectacle for computer use

  • 2. WHY DO COMPUTERS CAUSE EYE STRAIN ? • Accommodation: Computer use requires focusing & refocusing and eye alignment at 45-75 cm for long time • Vergence: When viewing computer screen, eyes become locked in this close range, increasing near-sightness or myopia • Dry eye: With sustained fixation, the eyes do not blink enough, so they dry out
  • 3. EYE STRAIN DUE TO WRONG MONITOR SETTING FOLLOWING MONITOR SETTING AFFECT EYES • REFRESH RATE refers to how often your monitor redraws the content on the screen 70 hertz or higher is better • RESOLUTION refers to monitor's pixel density • The more pixels, the higher the level of detail and less eye strain • DOT PITCH affects the sharpness of the display Lower the number, the sharper the image 0.28 or lower is desirable
  • 4. THE MONITOR VS. PRINTED PAGE THE SIGNAL FROM THE MONITOR IS NOT AS GOOD AS THE PRINTED PAGE • A monitor is a dynamic signal, in that screen is constantly being redrawn • A monitor creates images on the basis of varying light intensity through a fixed set of red, green and blue points. This results in less distinct edges, and lower contrast • The illumination of points on a monitor is not sharp, but is somewhat rounded.
  • 5. COMPUTER VISION SYNDROME (CVS) TYPICAL SYMPTOMS • Fatigue • Eyestrain • Headaches • Slow focusing • Tired, burning eyes • Neck and shoulder pain – Frequent bending forward & backward • Blurred vision at distance
  • 6. 9 STEPS TO REDUCE CVS 1. Get a computer eye exam 2. Use proper lighting 3. Minimize glare 4. Blink more often 5. Take frequent breaks 6. Exercise and stretch your eyes 7. Adjust the settings of your computer screen 8. Modify your workstation 9. Use separate eye ware for computer use
  • 7. AVAILABLE CORRECTIVE METHODS 1. FULL VISION READING GLASS 2. HALF EYE READING GLASS 3. TWO SEPARATE SPECTACLE 4. BI-FOCAL SPECTACLE 5. TRI-FOCAL SPECTACLE 6. REGULAR PROGRESSIVE LENSES
  • 8. AVAILABLE CORRECTIVE METHODS 1. Full vision reading glass Full vision reading glass • Clear near vision • Distance blur • Move close to monitor to see clearly. • Need Tint and ARC • Creating neck & back pain and CVS
  • 9. AVAILABLE CORRECTIVE METHODS 2. Half eye reading glass Half eye reading glass • Clear near vision • Distance blur • Must lower heads to an unnatural 15- 45° tilt • Suitable for patients, just becoming presbyopic • Creating neck & back pain and CVS
  • 10. AVAILABLE CORRECTIVE METHODS 3. Two separate spectacle • Clear near vision with reading glass • Clear distance vision with second glass • No Intermediate vision • In-convenient in keeping two spectacle
  • 11. AVAILABLE CORRECTIVE METHODS 4. Bi-focal spectacle • The segment may be too low and set for 30cm • Near vision through lower lens area • Lift their heads by 25° • Visible bi-focal line • Strain in neck and shoulder muscles
  • 12. AVAILABLE CORRECTIVE METHODS 5. Tri-focal spectacle Tri-focal Intermediate vision • Top of the glasses are for distance • Intermediate area for the computer use • Bottom segment for reading and keyboard • Visible tri-focal lines • Inconvenient and Outdated
  • 13. AVAILABLE CORRECTIVE METHODS 6. Regular progressive lenses • Multi focal / Graduated power Design • Lift their heads 25° • The reading area may not be high enough • Intermediate channel is not wide enough – (Hour Glass) • Outside of channel are distorted
  • 14. WHAT ARE COMPUTER EYE WARE ? • They are different from usual glasses • They need special prescription • Using different lens design • Special lens treatments • Optimum visual comfort and work efficiency • Ideal solution for CVS
  • 15. WHO NEED COMPUTER EYE WARE ? INDIVIDUALS WITH THE FOLLOWING DIAGNOSED CONDITIONS OFTEN REQUIRE COMPUTER GLASSES • PRESBYOPIA • HYPEROPIA • MYOPIA • ASTIGMATISM • HETEROPHORIA • DRY EYE • CONVERGENCE INSUFFICIENCY • DISORDERS OF ACCOMMODATION
  • 16. COMPUTER EYE WARE DIAGNOSTIC INSTRUMENTS This System simulates the real characteristics of computer screen in the doctor's clinic and cause eyes to react the same way as they do when you sit in front of computer in your office This allows the doctor to determine the exact correction and prescribe suitable computer eye ware E.g.. PRIO Diagnostic System
  • 17. SIGNIFICANCE OF LENS MATERIAL IN COMPUTER EYE WARE • CROWN GLASS: – Best optics and scratch resistant – Heavy and not safe, therefore not used very much • CR - 39: Standard plastic, excellent optics – Good for small and medium prescriptions • POLYCARBONATE : – Thin, light and strong - Safest lens • HIGH INDEX : – Good for higher prescriptions – Need Scratch resistant and Anti-reflective coatings • PHOTOCHROMIC: – No significance in computer eye ware
  • 18. SIGNIFICANCE OF LENS COATING IN COMPUTER EYE WARE • ULTRA-VIOLET (UV) COATING: – Monitors do not emit UV light – So computer eye ware do not need UV coatings • ANTI-REFLECTIVE COATINGS (ARC): – Reduce reflection and back glare – Available in gold, green and blue color • SCRATCH RESISTANT COATINGS (SRC): – This clear coating hardens to provide a durable, tougher lens – Scratch resistance does not mean scratch proof
  • 19. SIGNIFICANCE OF TINTING IN COMPUTER EYE WARE • THE TINTING: – Recommended for working in a bright lit office – This can cut the amount of light that reaches your eyes and provide relief – But tints and filters don't address the underlying cause of computer eyestrain – Example: Melanin tint • POLARIZATION: – These lenses provide excellent clarity and maximize visual acuity by minimizing glare
  • 20. SPECTACLES FOR COMPUTER USE 1. NORMAL VISION SPECTACLE 2. COMPUTER READING GLASSES 3. OCCUPATIONAL PROGRESSIVE LENSES 4. FLIP FOCALS OR CLIP-ON LENSES 5. PIN HOLE SPECTACLE 6. PC MAGNI VIEWER
  • 21. 1. NORMAL VISION SPECTACLE as computer eye ware • For people with normal vision • Have +0.25 D add power • Idea is not to add magnification • But to move focal point closer without using eye muscles for accommodation • Need ARC and tinting • Rimless frame • Height only 26 mm to permit viewing “underneath” to focus key board etc
  • 22. 2. COMPUTER READING GLASS as computer eye ware • DESIGNED TO SEE AT 45 – 75 CM • ANTI GLARE COATED & TINTED • EFFICIENT PROTECTION & REDUCE EYE STRAIN Normal Reading Glass Computer Reading Glass +0.75 to + 2.00D + 1.00 D +2.00 to + 2.50D + 1.25 D +2.50 to + 3.50D + 1.50 D
  • 23. 3a. OCCUPATIONAL PROGRESSIVES as computer eye ware Occupational Progressive • Multi-focal aspheric progressive design for both near and intermediate vision • Lower half for near vision correction • Upper half for mid range vision up to 2.50 M
  • 24. 3b. OCCUPATIONAL PROGRESSIVES as computer eye ware • Wide intermediate area for computer use • Benefit from a natural head and neck position • Ideal solution for CVS AVAILABLE BRANDS: • Power continuously reduced to: AO COMPACT +0.75 D for + 0.75 to + 1.75 NV Zeiss RD +1.25 D for + 2.00 to + 3.00 NV Panorama Mini ESSILOR Kodak Precise
  • 25. 4. FLIP FOCAL SPECTACLE as computer eye ware FLIP FOCALS IS A PAIR OF CLIP-ON ENHANCEMENTS • For Bifocals and progressives • Clip – on half frame glasses • Focus on monitor 45 – 75 cm from eye • Flip down lens for screen viewing • Flip up lens for normal viewing (distance) • Screen park holder, park on monitor • Poly carbonate, simply clip into frames
  • 26. 4. FLIP FOCAL SPECTACLE as computer eye ware Flip Focals Power calculation WORKING DISTANCE CLIP ON READING GLASS 30 – 48” + 1.00 D +0.75 to +2.00 D 24 – 42” + 1.25 D +2.00 to +2.50 D 18 – 36” + 1.50 D +2.50 to +3.50 D - Based on working distance from monitor - Approximately half of reading glass power
  • 27. 5. PIN HOLE SPECTACLE as computer eye ware • Low cost • No glare problem • Increased depth of field • The focusing effort or accommodation is reduced • Good solution for CVS
  • 28. 6. PC MAGNI VIEWER as computer eye ware • Small screens appear much larger, sharper and more distant • Large size and sharpness reduce accommodation problems, so the eye no longer needs to constantly refocus • Distant-appearing text lets your eyes stay parallel, so eye muscles relax • Economically better than buying a large monitor
  • 29. HOW TO CHECK THE QUALITY OF COMPUTER GLASSES ? • The lenses and its material should be of good quality • There should be no aberrations in the lens • Lenses must be centered both vertically and horizontally in front of the eyes • There should be no spaces between the lenses and frame • The lenses should be tilted 15 degrees towards the cheeks • The frame should be slight wrapped to match the contour of the face
  • 30. SELECTION & CARE • Wide choices are available in computer eye ware • Selection depends on occupational conditions, taste, and budget of people • Care must be taken in prescribing the power of computer eye ware • Need special lens design & treatments • Coating and tinting gives good result • Ergonomics is also important