Chapter 10-2 Flashcards

0
Q

Enzyme in tears that is antibacterial to reduce risk of eye infections

A

Lysozyme

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1
Q

Mucus membrane that lines the eyelids inner surface and covers anterior surface of eyeball

A

Conjunctiva

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2
Q

Function of the extrinsic muscle move eyes in various directions (6)

A

Superior rectus-rotate eye upward and toward midline
Inferior rectus-rotate eye downward and toward midline
Medial rectus-rotate eye inward toward midline
Lateral rectus-rotate eyes away from midline
Superior oblique-rotates eyes downward and away from midline
Inferior oblique-rotate upward and away from midline

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3
Q

Anterior, transparent window of eye that allows light rays to enter

A

Cornea

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4
Q

Outer white part of eye

A

Sclera

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5
Q

Vascular layer that contains pigment to keep inside of eye dark

A

Choroid coat

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6
Q

Thickest part, extends forward from choroid coat

A

Ciliary body

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7
Q

Transparent disk behind pupil for focusing

A

Lens

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8
Q

Ability of lens to change shape for focusing

A

Accommodation

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9
Q

Colored part of eye

A

Iris

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10
Q

Watery fluid between cornea and iris which helps nourish and maintain shape of cornea

A

Aqueous humor

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11
Q

Opening in iris for light to enter eye

A

Pupil

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12
Q

Thin delicate membrane which contains visual receptor cells

A

Retina

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13
Q

Depression in center of retina that produces sharpest vision

A

Fovea centralis

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14
Q

Region that lacks receptor cells

A

Optic disc

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15
Q

Transparent jelly like fluid in posterior cavity and helps maintain shape of eye

A

Vitreous humor

16
Q

Bending of a beam of light as it passes from one medium to another

A

Light refraction

17
Q

What’s the difference between convex and concave

A

Convex surface causes light waves to converge outward

Concave surface causes light waves to converge inward

18
Q

Differ between rods and cones

A

Cones-sharp images; Rods-general outline of objects
Rods-hundred times more sensitive to light than Cones
Rods-colorless vision; cones-detect color

19
Q

Sharpness or degree of detail the eye can see

A

Visual acuity

20
Q

4 factors of visual acuity

A

Brightness, size of object, color of object, retinal area on which image of object falls

21
Q

Light sensitive chemical in rods that breaks down into the protein opsin and retinal which is made from vitamin A

22
Q

Name and define characteristics of color vision

A

Hue-sensory response made by our eyes to various wavelengths
Saturation-quality of color dependent on amount of white light present
Brightness-intensity of light waves reflected by surface

23
Q

Purkinje shift is what

A

Shift from light to dark adaptation and vice versa

24
Carry over of visual impressions
After image
25
Eye disorder explain astigmatism
Abnormal curvatures of the surface of cornea or lens
26
Eye disorder explain myopia
Eyeball is too long from front to back
27
Eye disorder explain hyperopia
Eyeball is too short from front to back
28
Eye disorder explain presbyopia
Decline in usual accommodation with age
29
Eye disorder explain color blindness
Deficiency in color perception
30
Eye disorder explain cataract
Clouding of the lens
31
Eye disorder explain glaucoma
Amount of aqueous humor increases and eyeball becomes hard
32
Eye disorder explain conjunctiva
Inflammation of conjunction