the human eye

1. EEYYEE
The eye is an
extension of
the brain
Made by
kush sehgal
xi science
r.no 29

2. EEyyee bbrraaiinn
pprrooxxoommiittyy
This shows
the optic
nerve bundle
Spinal cord

3. CCrroossss
sseeccttiioonn
The positions of
Retina
Lens
Cornea
Sclerotic
Optic nerve
Cilary muscles
Suspensory ligaments

4. RReettiinnaa –– rreecceeiivveess tthhee iimmaaggee
Full of light
receptors which
are sensitive to:
Colour
Light levels
Massive blood
supply is also
needed
Fovea is the main
focal point and has
greatest density of
light receptors

5. RReettiinnaa rreecceeppttoorrss
Light
receptors
are called
rods and
cone

6. FFooccuussiinngg
oonn oobbjjeeccttss
The lens and
cornea focus
the light on the
retina

7. FFooccuussiinngg
The lens job is
to make the
rays hit the
same point
The red rays will
be out of focus

8. NNeeaarr vviissiioonn
 to bend the
light more
to focus it
Fat lens
needed

9. DDiissttaannccee vviissiioonn
Rays enter the
eye closer
together
Need less
bending
Thinner lens
needed

10. CChhaannggiinngg lleennss tthhiicckknneessss
The lens is slightly
elastic, its relaxed
state is short and fat.
Cilary muscles are
attached to the lens, when
contracted they pull the
lens thin

11. CCoonnttrroolllliinngg
lliigghhtt lleevveellss
Your eye are very
sensitive and can be
damaged by harsh
light.
Your iris controls
light allowed into
the eye by changing
the size of the pupil