vision Flashcards by tayani srichumpon

Q

wavelenght that we can respond but not see

A

UV and IR

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Q

choroid has

A

high conc. of blood vessels

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Q

sclera is the

A

eye white

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Q

fovea is the

A

most receptive part of the eye

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Q

function of fovea

A

produce visual info

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Q

what is the dioptic media

A

a light pathway

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Q

components of diopteric media

A

cornea, aq. fluid, lens and vitreous media

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Q

emmetropia

A

normal eyesight

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Q

ametropia

A

abnormal eyesight

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Q

types of ametropia

A

myopia, hyperopia, presobyopia, astigmatism

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Q

whats a snellen chart

A

eyesight chart for testing

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Q

whats an accommodation reflex

A

reflexes such as focusing length, iris size and lens size

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Q

retina contains

A

photoreceptors, neurons and pigmented epithelium

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Q

function of epithelium

A

provide nutrients, remove waste, set outer rod segment

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Q

rod function

A

brightness in the dark

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Q

cone function

A

brightness and color in the light

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Q

what is macula lutea

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A

yellow surface around fovea

Q

fovea centralis function

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A

responsible for high-acuity visual

Q

20 degrees (on the right eye)

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A

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

Q

in the dark, the nerves are

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A

depolarised

Q

in the light, the nerves are

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A

hyperpolarised

Q

11 cis retinal occurs in the

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A

dark

Q

all trans retinal occurs in the

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A

light

Q

tranducsin is a

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A

G protein

what does transducin activate

PDE

what does PDE do

hydrolyse cGMP to reduce its conc.

cGMP hydrolysis causes

Na+ channel to close

rhodopsin is made up of

retinal + opsin

what is amaurosis

vision loss not due by lesion

treatment for leber amaurosis

viral-based gene therapy (luxtura) via AAV

cone cells are photopigments and can tell apart what colors

red, green and blue

monochromats

grey scale

dichromats

green and blue

trichromats

green, blue and red

ishihara pseudoisochromatic

a test for color blind

is colorblindness hereditary

yes

achromatopsia condition

cant see colors

visual pathway

eye -> thalamus -> occipital

different pathway disruption

different blindness pattern

binocular vision is

the ability to combine and compare info from eye

binocular is the crossing of

optic fibers