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Definition
| membrane that lines inner surface of eyelids and covers anterior surface of eyeball |
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Definition
| transparent covering on anterior surface helps focus light. |
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Definition
| white of eye, tough protection |
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Definition
| layer in middle tunic contains blood vessels and meanocytes to absorb excess light; keeps eye dark inside |
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Definition
| forms internal ring around front of eye; contains ciliary muscles and suspensory ligaments |
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Term
| suspensory ligaments and ciliary muscles |
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Definition
| holds lens in position and changes shape of lens to focus light |
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Term
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Definition
| what shape is the lens when viewing a close object? |
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Term
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Definition
| What's the process called when the lens thickens to view close objects. |
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Definition
| colored part of eye made of smooth muscle that changes the size of pupil |
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Definition
| space between iris and cornea that's filled with aqueous humor |
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Definition
| provides nutrients to cornea and keeps the eyeballs convex shape |
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Definition
| opening in the iris to allow light to enter the back of eye |
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Definition
| inner tunic layer that contains visual receptors |
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Term
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Definition
| inner tunic layer that contains visual receptors |
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Term
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Definition
| yellowish spot or region in center of retina |
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Definition
| depression in center of macula that produces sharpest vision |
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Term
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Definition
| blind spot where nerve fibers leave the eye to join optic nerve |
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Term
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Definition
| jelly-like fluid that supports the shape of posterior cavity |
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Term
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Definition
| occurs when light waves pass through objects of different densities |
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Term
ot
it's upside down and reversed from left to right |
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Definition
| How is the image refracted on the retina different from the actual image? |
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Term
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Definition
| condition that occurs when "old" lens becomes inflexibe and can't accomodate for close objects |
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Term
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Definition
| eyeball is too long and the image focuses short of the retina; nearsightedness |
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Term
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Definition
| eyeball is too short and focuses the image behind the retina; farsighted |
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Term
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Definition
| an elliptical shaped cornea or dimpled cornea that creates a partially focused image |
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Definition
| visual receptors for dim light; less sharp vision; no color |
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Term
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Definition
| visual receptors for color; sharp vision; 3 different types |
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Term
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Definition
| pigment in cones to absorb red light waves |
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Definition
| color pigment in cones that absorbs green light waves |
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Definition
| color pigment in cones that absorbs blue light |
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Definition
| visual receptor most numerous in fovea centralis |
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Definition
| most numerous photoreceptor; 100 million of them; numerous on sides of eyeball |
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Definition
| pigment in rods that decomposes when light hits it |
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Term
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Definition
| when an eye in the dark converts all its opsin and retinal to make lots of rhodopsin. It is ______ |
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Term
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Definition
| What are the 3 color cones? |
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Term
| stereoscopic or binocular vision |
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Definition
| when each eye produces a slightly different image, and this allows the eye to see in 3 dimensions |
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Term
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Definition
| a person that lacks a cone type because of a mutation is said to be __________ |
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Term
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Definition
| place where portions of optic nerve cross-over, so both rt. and lt. occipital lobes get images from both eyes |
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Term
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Definition
| condition where aqueous humor forms faster than it drains and pressure increases inside the eye; can lead to blindness |
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Term
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Definition
| redness and inflammation in the conjunctiva; many causes like infection, allergies, irritating particles |
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Term
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Definition
| lens becomes cloudy from old age or u.v. damage |
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Term
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Definition
| condition caused by damage or deficiency in rods on sides of eyeball |
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Term
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Definition
| deterioration of the macula that produces incomplete and blurred images |
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Term
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Definition
| the image that remains when the rods or cones have decomposed their pigments and aren't able to send further images |
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Term
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Definition
| collection of nerve fibers that leaves the back of eacy eyeball from the optic disk |
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