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Flashcards in anatomy final - vision Deck (11)
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Refraction

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

1

Accommodation

Rounding of lens for near vision

2

Myopia

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

3

Hyperopia

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

4

Presbyopia

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

5

Constriction of pupil

Improves depth of field.

6

Convergence

Focusing both eyes on same object. Improves depth perception.

7

Rods

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

8

Dark adaptation

Adjustment to change from bright light to dim light.

9

Cones

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

10

Light adaptation.

Adjustment to change from darkness to light.