anatomy final - vision Flashcards

(11 cards)

0
Q

Accommodation

A

Rounding of lens for near vision

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1
Q

Refraction

A

Bending of light rays (necessary for focus) from air, cornea, aqueous humor, lens, vitreous humor.

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2
Q

Myopia

A

Nearsightedness - eyeball is too long, so image focuses in front of fovea.

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3
Q

Hyperopia

A

Farsightedness - eyeball is too short and image focuses behind fovea.

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4
Q

Presbyopia

A

Failure of lens to accommodate. Lens remains flat for far vision. It loses elasticity. This is what happens for old farts.

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5
Q

Constriction of pupil

A

Improves depth of field.

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6
Q

Convergence

A

Focusing both eyes on same object. Improves depth perception.

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7
Q

Rods

A

Photoreceptors for dim, black and white vision. Located all over retina except fovea.

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8
Q

Dark adaptation

A

Adjustment to change from bright light to dim light.

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9
Q

Cones

A

Photoreceptors for detailed color vision. Most concentrated in macula lutea.

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10
Q

Light adaptation.

A

Adjustment to change from darkness to light.

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