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physio 01 23 > vision > Flashcards

vision Flashcards

1
Q

wavelenght that we can respond but not see

A

UV and IR

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2
Q

choroid has

A

high conc. of blood vessels

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3
Q

sclera is the

A

eye white

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4
Q

fovea is the

A

most receptive part of the eye

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5
Q

function of fovea

A

produce visual info

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6
Q

what is the dioptic media

A

a light pathway

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7
Q

components of diopteric media

A

cornea, aq. fluid, lens and vitreous media

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8
Q

emmetropia

A

normal eyesight

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9
Q

ametropia

A

abnormal eyesight

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10
Q

types of ametropia

A

myopia, hyperopia, presobyopia, astigmatism

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11
Q

whats a snellen chart

A

eyesight chart for testing

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12
Q

whats an accommodation reflex

A

reflexes such as focusing length, iris size and lens size

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13
Q

retina contains

A

photoreceptors, neurons and pigmented epithelium

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14
Q

function of epithelium

A

provide nutrients, remove waste, set outer rod segment

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15
Q

rod function

A

brightness in the dark

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16
Q

cone function

A

brightness and color in the light

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17
Q

what is macula lutea

A

yellow surface around fovea

18
Q

fovea centralis function

A

responsible for high-acuity visual

19
Q

20 degrees (on the right eye)

A

blind spot since it is at the optic n, theres no rods or cones there

20
Q

in the dark, the nerves are

A

depolarised

21
Q

in the light, the nerves are

A

hyperpolarised

22
Q

11 cis retinal occurs in the

A

dark

23
Q

all trans retinal occurs in the

A

light

24
Q

tranducsin is a

A

G protein

25
Q

what does transducin activate

A

PDE

26
Q

what does PDE do

A

hydrolyse cGMP to reduce its conc.

27
Q

cGMP hydrolysis causes

A

Na+ channel to close

28
Q

rhodopsin is made up of

A

retinal + opsin

29
Q

what is amaurosis

A

vision loss not due by lesion

30
Q

treatment for leber amaurosis

A

viral-based gene therapy (luxtura) via AAV

31
Q

cone cells are photopigments and can tell apart what colors

A

red, green and blue

32
Q

monochromats

A

grey scale

33
Q

dichromats

A

green and blue

34
Q

trichromats

A

green, blue and red

35
Q

ishihara pseudoisochromatic

A

a test for color blind

36
Q

is colorblindness hereditary

A

yes

37
Q

achromatopsia condition

A

cant see colors

38
Q

visual pathway

A

eye -> thalamus -> occipital

39
Q

different pathway disruption

A

different blindness pattern

40
Q

binocular vision is

A

the ability to combine and compare info from eye

41
Q

binocular is the crossing of

A

optic fibers

physio 01 23 (5 decks)

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