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Cards In This Set
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Refraction
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The bending of light rays that can occur when they travel from one transparent medium to another; how images are formed in the eye
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Pupil
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Opening in the eye that allows light to enter and reach retina; light absorbing pigment
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Iris
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Surrounds pupil; contains 2 muscles to either make the pupil smaller when it contracts or to make it larger
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Cornea
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Glassy transparent external surface of the eye
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Sclera
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"white of the eye"; forms tough wall of eyeball, continuous from cornea
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Extraocular muscles
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Move eyeball in the eye's orbit; inserted into sclera; not visible
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Conjuctiva
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Membrane that folds back from inside of eyelids and attachs to sclera
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Optic nerve
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Carries axons from retina, exits back of the eye, passes through the orbit and reaches the base of the brain near the pituitary gland
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Optic disk
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Where optic nerve fibers exit the retina; no photoreceptors (blind spot)
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Macula
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Part of retina for central vision; large blood vessels are relatively absent here wwhich improves the quality of central vision
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Fovea
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Retina is thinner here; center of retina-splits retina into nasal and temporal/superior and inferior; cones and photoreceptors, specialized for high acuity of vision
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Aqueous humor
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Fluid behind cornea that nourishes it; between lens and cornea
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Lens
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Transparent;; behind iris, suspended by ligaments attached to the ciliary muscles
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Ciliary muscles
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Attached to sclera and form ring around eye, changes in shape of lens enable eyes to adjust focus to different viewing distances
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Vitreous humor
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Between lens and retina; pressure here keeps the eyeball spherical
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