Whether hiking, out skiing for the day or on holiday at the beach, good sun protection is essential.
But how can you tell if the glasses you're wearing are suitable and give you enough protection?
2. CONTENTS
1. Introduction
2. What do sunlenses protect our eyes from?
3. How do sunlenses protect our eyes?
4. Julbo sun solutions
3. Whether hiking, out skiing for the day or on holiday at the beach, good sun
protection is essential.
But how can you tell if the glasses you're wearing are suitable and give you
enough protection?
The first Julbo sunglasses saw the light of day more than 125 years ago.
And since then, Julbo has worked to produce the very best protection for
eyes whatever the conditions.
Whether it's extreme brightness at the top of an 8,000 m peak or the
elimination of glare in an offshore sailing race, Julbo has developed a lens
adapted to each situation.
With its experience of extreme conditions, Julbo understands the various
factors involved in creating powerful lenses that offer the very best
performance...
and we can now pass our expertise on to you, helping you to understand
the issues involved and advice on how to choose the right sunlenses.
4. 2. WHAT DO SUNLENSES PROTECT OUR EYES FROM?
// Invisible light
Ultraviolet light: which is highly damaging to the eye. While UVA radiation is less
dangerous, UVB causes burning and numerous symptoms affecting vision.
All Julbo lenses offer protection against UV light.
Infrared radiation can be dangerous for the eyes in extreme
conditions (high mountains, desert, etc.), causing dehydration
and overheating.
Julbo Alti Arc lenses provide optimum protection against
IR light in all conditions.
UTLRA-
VIOLET
VISIBLE
LGHT
INFRARED
mm
mm
mm
mm
mm
VIOLET - BLUE
Source:guide-vue.fr
Cornea
Iris Crystalline lens
Optical nerve
RetinaPupil
5. 2 // Visible light
The dangers posed by visible light include glare, fatigue, interference and
a possible temporary reduction in vision.
However, this light is not always of the same intensity. Lenses are
therefore assigned categories from 1 to 4 to give an indication of how
much light they filter out.
These categories also suggest the type of conditions the sunlenses can
be used in, as the more intense the light, the higher the category should
be.
Warning: Category 4 lenses are not permitted for driving as
they filter out too much light.
!
6. 2 // Categories
Coding Category Application Transmission
A 0 Comfort 80 to 100%
AB 1 Low light levels 43 to 80%
B 2 Average light levels 18 to 43%
C 3 Strong light levels 8 to 18%
D 4 Exceptional light levels 3 to 8%
Lens category depends on the quantity of light (visible light transmission
rate) that passes through it.
9. 3 // Lens colors
Lens color will determine how it filters light and give it specific
characteristics.
Green:
Accentuates green contrast: ideal for golf or other activities on
grass.
Yellow/Brown:
accentuates and highlights relief:
ideal for outdoor sports.
Grey:
faithful color reproduction; ideal for watersports and everyday use.
Red:
accentuates red contrast.
Copper or pink:
accentuates contrast and increases viewing comfort: ideal for
travel and driving.
Blue:
accentuates blue contrast.
11. 3 // Technical filters: polarizing treatment
Polarizing treatment:
provides the most effective protection and best comfort in the sun by
operating on the principle of Venetian blinds,
light only enters the eye along 1 axis.
protects from glare by cutting out rays of light reflecting off a flat /
horizontal surface (water, snow, windscreen, etc.),
intensifies colors and improves contrast and relief.
Visual noise generated by
the reflective surface
Polarized lens blocking
reflections
Light sent in all directions
Reflective area Only rays of light providing
information enter the eye
Source:général-optique.com
12. 3 // Technical filters: other treatments
Anti-reflective: prevents glare caused by rays of light reflected from
the back of the lens.
Anti-fog: prevents condensation and fogging.
Oil-repellent/Water-repellent: facilitates the run-off of liquids and
cleaning of greasy matter deposited on the lens (fingermarks, grease
from the skin or hair, creams, etc.).
Mirror: increases the filtration rate of the lens and makes the eyes
less visible. Primarily an esthetic treatment.
15. 4 // Mineral lenses
Of superior optical quality and highly resistant, they are ideal for desert
and high-mountain environments.
This lens is an essential benchmark for glacier glasses.
17. 4 // Polycarbonate lenses
Light and resistant, these lenses are versatile and suitable for all activities.
Julbo Spectron lenses exist in several colors and categories to offer you a
high-quality lens that best matches your own needs.
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18. 4 // Mirror-finish polycarbonate lenses
The 3+ML Spectron lens has a multi-layer coating to produce a mirror
effect matching the color of the frames, giving you both style and
protection.
19. 4 // Polarized polycarbonate lenses
These top-of-the-range lenses provide all the advantages of a Julbo
polycarbonate lens with the additional comfort of a polarizing filter.
These lenses therefore offer greater contrast and significant elimination of
glare on various surfaces (snow, water, roads, etc.).
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20. 4 // Junior lenses
These top-of-the-range lenses provide all the advantages of a Julbo
polycarbonate lens with the additional comfort of a polarizing filter.
These lenses therefore offer greater contrast and significant elimination of
glare on various surfaces (snow, water, roads, etc.).