Chapter 10-2 Flashcards Preview

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Flashcards in Chapter 10-2 Deck (33)
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0
Q

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

A

Lysozyme

1
Q

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

A

Conjunctiva

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

3
Q

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

A

Cornea

4
Q

Outer white part of eye

A

Sclera

5
Q

Vascular layer that contains pigment to keep inside of eye dark

A

Choroid coat

6
Q

Thickest part, extends forward from choroid coat

A

Ciliary body

7
Q

Transparent disk behind pupil for focusing

A

Lens

8
Q

Ability of lens to change shape for focusing

A

Accommodation

9
Q

Colored part of eye

A

Iris

10
Q

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

A

Aqueous humor

11
Q

Opening in iris for light to enter eye

A

Pupil

12
Q

Thin delicate membrane which contains visual receptor cells

A

Retina

13
Q

Depression in center of retina that produces sharpest vision

A

Fovea centralis

14
Q

Region that lacks receptor cells

A

Optic disc

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

A

Rhodopsin

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
Q

Carry over of visual impressions

A

After image

25
Q

Eye disorder explain astigmatism

A

Abnormal curvatures of the surface of cornea or lens

26
Q

Eye disorder explain myopia

A

Eyeball is too long from front to back

27
Q

Eye disorder explain hyperopia

A

Eyeball is too short from front to back

28
Q

Eye disorder explain presbyopia

A

Decline in usual accommodation with age

29
Q

Eye disorder explain color blindness

A

Deficiency in color perception

30
Q

Eye disorder explain cataract

A

Clouding of the lens

31
Q

Eye disorder explain glaucoma

A

Amount of aqueous humor increases and eyeball becomes hard

32
Q

Eye disorder explain conjunctiva

A

Inflammation of conjunction