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22 Cards in this Set
- Front
- Back
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Binocular vision |
Vision in whichboth eyes are used together |
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Stereoscopic vision |
Ability to see depth and solidity of objects. Both images are combined to form a 3d image |
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Accommodation of the eye |
Refers to the ability of the eye to alter the shape of the lens to ensure that a clear image always falls on the retina whether the object is near or distant |
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Pupiliary mechanism |
The process by which the diameter of the pupil is altered so as to control the amount of light entering the eye |
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Conjunctiva |
Cover the exposed part of the eye |
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Cornea |
Permits light to enter, refracts light so as to focus on the retina |
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Iris |
Controls the size of the pupil. Has radial and circular muscles |
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Lens |
Refracts light rays entering the eye so as to focus them on the retina |
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Pupil |
Controls the amount of light entering the eye |
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Aqueous humour |
Maintains shape of cornea, supply lens and cornea with food and oxygen and plays a minor role on refracting light |
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Suspensory ligaments |
Holds the lens in position |
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Ciliary muscle |
Helps alter the lens shape for near and distant vision |
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Ciliary body |
Contains ciliary muscles to help alter the shape of the lens |
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Optic nerve |
Carry impulses from retina of the eye to the cerebrum of the brain |
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Yellow spot |
Centre of clearest vision. Has very high concentration of cone cells, no rod cells |
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Vitreous humour |
Maintain the shape of the eye ball, play a minor role in refraction of light |
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Choroid |
Pigmented, absorbs scattered light rays therefore prevent reflecting of light |
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Sclera |
Protects the inner structures, maintains the round shape of the eye |
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Retina |
Images form here, light sensitive layer, has rod and cone cells, receptors |
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Blindspot |
Area of the retina from which the optical nerve arises, no rod or cone cells , not light sensitive |
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Rod cells |
Responsible for vision in dim light |
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Cone cells |
Responsible for bright light and color vision |
