Vision Flashcards

(29 cards)

1
Q

What type of muscles are the extraocular muscles and where do they attach

A

Rectus, sclera

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2
Q

Name all the structures the light passes through

A

cornea, pupil, lens, rertina (fovea centralis)

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3
Q

In macula degeneration is the blindness in the centre or periphery

A

centre

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4
Q

what is the name of the membrane covering the sclera

A

conjuctiva

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5
Q

when the cilliary muscles contract, what shape is the lends

A

fatter

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6
Q

what is the function of the choroid

A

carries blood vessels, maintains photoreceptors

also theh are highly pigmented and contain melain

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7
Q

which structure sperates the a and p chambers

A

iris!

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8
Q

what supplies blood to the inner two thirds of the retina

A

central artery and vein

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9
Q

what supplies blood to the outer third of the retina

A

choroid

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10
Q

what supplies nutrients to the ganlion cells

A

vitreous humour

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11
Q

what produces aqueuos humor and where does it drain out

A

Produced by cilliary body, drained out bu schlemms canal

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12
Q

does the aquous humor enter the a or p chamber first

A

posterior

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13
Q

which nerve innervates the intraocular rectus muscles

A

3

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14
Q

where are the lacrimal glands located and what cranial nerve innervates them

A

top lateral corner, cn 7

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15
Q

which cn does somatic senory and which one does special sensory

A

somatic = 5, special = 2

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16
Q

name the structure that supports the outer retina

A

pigment epithelium

  • contains melalin (therefore dark)
  • absrobs light and precents scattering of light, maintains photoreceptos metabolically
17
Q

at which point does light become an electical signal, at which point does it become an AP

A

electical at photorecptors, AP at ganglion cells

18
Q

which nucleus in the midbrain does visual reflexes

A

superior colliculus

19
Q

which nucleus in that thalamus is involved in vision

A

lateral geniculate nucleus

20
Q

how is power measured

A

1/focal length

21
Q

what is the term for when the lens is too strong - and what does it cause

A

myopia - short signeedness

far point

22
Q

explain hyperopia

A

lens too weak, longsightedbess

near point

23
Q

what is the term for when the cornea has different focusing powers in its planes

A

astigmatism

more commonly thicker from side view

24
Q

what type of lens correcrs astogmatism

25
list the steps in transduction
light hits receptir pigment molecule changes shape series of reactions membrane channel blocked receptor hyperolarises
26
which type of photorecepto is for day vision
cone! rem: eating an ice cream cone on a beach
27
which cones respond best to low wasvelengths
blue!!
28
do green greens respond best to low, medium or high
medium!
29
which wavelength do red respond to best
longggggg