Eye Flashcards

1
Q

what is a conjunctiva

A

a transparent mucous membrane that lines
eyelids and covers anterior surface of eyeball, except cornea

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2
Q

what do tears help with

A

help to wash away foreign particles, deliver
O2 and nutrients, and prevent infection with a bactericidal lysozyme

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3
Q

where do tears flow through

A

flow through lacrimal punctum (opening on edge of each eyelid)
to the lacrimal sac, then into the nasolacrimal duct emptying into
nasal cavity

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4
Q

what are the eye muscles

A

superior, inferior, medial, and lateral rectus, and superior and inferior obliques

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5
Q

what are the three principal components of the eyeball

A

the three tunics, the neural component, and the optical component

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6
Q

what is the tunica vasculosa

A

middle vascular layer

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7
Q

what is the tunica fibrosa

A

outer fibrous layer

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8
Q

what is the tunica interna

A

retina and beginning of optic nerve

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9
Q

what releases the aqueous humor

A

ciliary body

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10
Q

what reabsorbs the aqueous humor

A

scleral venous sinus

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11
Q

what is a cataract

A

the clouding of the lens caused by age, diabetes, smoking, drugs, etc

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12
Q

what is glaucoma

A

elevated pressure within the eye due to obstruction of scleral venous sinus and improper drainage of aqueous humor

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13
Q

when does pupil constriction and dilation occur

A

when light intensity changes or when our gaze shifts between distant and nearby objects

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14
Q

what is emmetropia

A

state in which the eye is relaxed and focused on an
object more than 6 m (20 ft) away

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15
Q

what are the 3 adjustments for the near response

A

convergence of eyes, constriction of pupil, and accommodation of lens

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16
Q

what is hyperopia and what eye shape is it?

A

farsightedness, short eye

17
Q

how do you fix farsightedness?

A

convex lens

18
Q

what is myopia and what eye shape is it?

A

nearsightedness, long eye

19
Q

how do you fix nearsightedness?

A

concave lens

20
Q

what do rod cells help with?

A

night vision, scotopic vision, or
monochromatic vision

21
Q

what is the outer segment of rod cells?

A

modified cilium specialized to absorb light

22
Q

what is the inner segment of rod cells?

A

contains organelles sitting atop cell body with nucleus

23
Q

what do cone cells do?

A

color, photopic, or day
vision

24
Q

what pigment do cone cells have?

A

phodopsin