The Eye

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Eyelids
Can cover and protect the eye, blinking serves to distribute fluid over the surface of the eye and prevent it drying up.
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Conjuctiva
A thin membrane covering the front part of the eye. It is part of the skin which is transparent.
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Sclera
White part of the eye, tough, non – elastic, fibrous coat around the eyeball.
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Cornea
Transparent front part of the sclera, it refracts light rays and helps form an image on the retina.
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Choroid
Layer of tissue lining the inside of the fibrous coat, it contains many blood vessels supplying food and oxygen to the retina, it is black and stops the light being reflected back out of the eye.
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Optic Nerve
Carries impulses to the brain.
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Blind Spot
The place where the optic nerve leaves the retina. There are no light sensitive cells present.
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Retina
The retina contains 2 types of cell sensitive to light, cones are sensitive to coloured light and rods are sensitive to light of low intensity.
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Iris
Contains rapidly arranged muscle fibres whose contraction and relaxation widen or reduce the size of the pupil. It controls the size the amount of light that enters the eye.
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Lens
Continues the refraction of light to produce an image on the retina, the lens is held in position by the fibres of the suspensory ligaments, the shape of the lens can be altered by the contraction and relaxation of muscles in the ciliary body. It foc
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Aqueous and Vitreous Humours
The A.H. is fluid and V.H. is jelly-like. Their pressure helps to maintain the shape of the eye, the lens, cornea, and conjunctiva are made of cells containing no blood supply. They must obtain their food and oxygen from the A.H.
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Other cards in this set

Card 2

Front

A thin membrane covering the front part of the eye. It is part of the skin which is transparent.

Back

Conjuctiva

Card 3

Front

White part of the eye, tough, non – elastic, fibrous coat around the eyeball.

Back

Preview of the back of card 3

Card 4

Front

Transparent front part of the sclera, it refracts light rays and helps form an image on the retina.

Back

Preview of the back of card 4

Card 5

Front

Layer of tissue lining the inside of the fibrous coat, it contains many blood vessels supplying food and oxygen to the retina, it is black and stops the light being reflected back out of the eye.

Back

Preview of the back of card 5
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