The eye is an extension of the brain
Can you see :
the optic nerve bundle?
You must know the position of:
Full of light receptors which are sensitive to:
Massive blood supply is also needed
Fovea is the main focal point and has greatest density of light receptors
Light receptors are called rods and cone
The lens and cornea focus the light on the retina
The lens job is to make the rays hit the same point
The red rays will be out of focus
Light is refracted and bent to focus it as it passes through the lens
Lens thickness can be changed so the amount of bending is changed
to bend the light more to focus it
Fat lens needed
Rays enter the eye closer together
Need less bending
Thinner lens needed
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
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