A thick, tough outer layer of the eye which maintains the shape and protects the inner components
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Choroid Layer
Has a high concentration of melanin and blood vessels and absorbs light rays so as to prevent reflection
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The Retina
The inner most part of the eye, which recieves light stimuli, with the photoreceptors (ganglion, rod and cone cells) it contains then processing the information from the light
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The Fovea
Has a high concentration of cone cells, giving high visual acuity
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The Conjunctiva
A thin, protective, outer layer of the eye which is kept moist by a fluid secreted by the tear ducts
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The Cornea
Continues from the sclera; refracts light rays and focuses them on the retina
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The Iris
A circular piece of tissue containing radial and circular muscles which contract and relax to change the shape of the pupil. This adjusts the amount of light that can enter the eye
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The Pupil
The 'hole' in the middle of the iris that light enters through. Its shape is adjusted by the iris
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The Ciliary Body
Contains the ciliary muscle which control the shape of the lens
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The Suspensory Ligaments
Lie between the lens and the ciliary muscle, adjusting the size of the lens by changing the amount of tension it applies. It also holds the lens in place
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The Lens
Is formed of long, narrow, transparent cells which create a biconcave shape, focusing light onto the retina.
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The Vitreous Humour
A thick fluid which lies behind the lens and creates an outwards pressure, maintaining the shape of the eye.
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The Aqueous Humour
A fluid found in front of the lens which creates an outward pressure, maintaining the shape of the front of the eye
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The Optic Nerve
A bundle of nerve fibres which carry action potentials to the brain
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Other cards in this set
Card 2
Front
Has a high concentration of melanin and blood vessels and absorbs light rays so as to prevent reflection
Back
Choroid Layer
Card 3
Front
The inner most part of the eye, which recieves light stimuli, with the photoreceptors (ganglion, rod and cone cells) it contains then processing the information from the light
Back
Card 4
Front
Has a high concentration of cone cells, giving high visual acuity
Back
Card 5
Front
A thin, protective, outer layer of the eye which is kept moist by a fluid secreted by the tear ducts
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