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The eye
- Light enters the eye through the cornea. The cornea
and the eye lens focus the light on to the retina.
- The iris adjusts the size of the pupil to
control the amount of light entering the eye.
- The ciliary muscles alter the thickness of the lens to control the fine focusing of
the eye. They are attached to the lens by the suspensory ligaments.
- Eye lens - focuses light onto the retina
- Retina - the light sensitive cells around the inside of the eye.
- Blind Spot - The region where the retina is not
sensitive to light (no light-sensitive cells present)
- Optic-nerve - carries nerve impulses
from the retina to the brain.
- Ciliary muscles - Attached to the lens by suspensory
ligaments. The muscles change the thickness of the eye lens.
- Pupil - The central hole formed by the iris. Light
enters the eye through the pupil.
- Cornea - Transparent layer that
protects the eye through the pupil.
- Iris - Coloured ring of muscle that controls the
amount of light entering the eye.
- The normal human eye has a near point of 25cm
and a far point of infinity, so its range of vision is
from 25cm to infinity
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