words worth knowing- structure of the eye

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sclera
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opaque, white covering that surronds the eye, and gives the eye its shape
cornea
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clear covering in front of the pupil and the iris
lacrimal glands
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tear glands; help to nourish the cornea
iris
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circular muscles that surround the eye, contractions and relaxations help regulate light entering the eye
pupil
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an opening in the eye that absorbs the light
ciliary muscles
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musles that relax and contract to change shape of the lens, adgustments are called ACCOMADATING
aqueous humor
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liquid produced by the the Anterior Chamber to clean and nourish the cornea
lens
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convex shaped disc and it is held in place by the ciliary muscles
vitreous humor
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gel like substance that surround the les to protect it
retina
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the back of the eye, contains photoreceptors that detect light
optic disk
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the entrance point of the optic nerve
blind spot
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the optic disk has no photorecepters, therefore creating a blind spot in the vision
optic nerve
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nerves that send the informationcollected by the eye to the brain
choroid
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connectibe tissue that lies between the retina and the sclera
macula
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area in the center of the retina that is responsible for high acuity in the center of our vision
fovea
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dimple in the retina that has 100% accurate vision because it consists only of cone cells
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