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PHSL231 > Vision > Flashcards

Vision Flashcards

1
Q

What are the features of vision?

A

Colour, shape, depth, movement

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2
Q

what is the wavelength of visible light

A

400-750nm

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3
Q

what are the 2 features of light

A

wavelength and amplitude

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4
Q

What happens to the amplitude if the lights are turned off

A

it will decrease

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5
Q

what are the 2 basic components of the eye

A

the optical and neural component

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6
Q

what does the optical component do

A

collects and focuses light onto the planbt of the retina

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7
Q

what does the neural component do

A

converts light energy into patterned changes of membrane potential that he brain can decode to create visual perceptions

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8
Q

holds lense in place

A

zonule fibers

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9
Q

maintains intraocular pressure

A

aqueous humor

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10
Q

move eye around the skull

A

extraocular muscles

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11
Q

depression in the retina where we have the strongest vision

A

fovea

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12
Q

ganglion cells in the back of the eye

A

retina

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13
Q

densely pigments cells help absorb light (albino people dont have this)

A

choroid

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14
Q

the white bits of the eye

A

sclera

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15
Q

what is optics

A

refraction of the eye

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16
Q

what is refraction

A

the bending of light as it passes from one substance to another

17
Q

what part of the eye is responsible for the eyes ability to bend light

A

the cornea

18
Q

what is the refractive power

A

the ability of a substance to bend light and it is measured in diopters

19
Q

what is the power of a lens that converges light to a focal point 1 meter beyond the lens

A

1 diopters

20
Q

what is the power of a lens that converges light to a focal point 0.5 m meter beyond the lens

A

2 diopters

21
Q

What is the refractive power of the eye

A

60 diopters - focal point of 17mm beyond the lens

22
Q

what process occurs when shifting gaze from distant to near objects?

A

Accommodation, constriction of pupil and convergence of eyes

23
Q

what is accomodation

A

it is the contraction/relaxation of cillary muscles to alter lens shape and change refractive power

24
Q

What do the cilary muscles do when looking at distant objects

A

they are relaxed due to low parasympathetic activity so the zonular fibres are taut and the lens is flattened

25
Q

firing of parasympathetic nerves contracted ciliary muscles, slackened zonular fibers, rounded lens

A

near object with accomodation

26
Q

normal sight (faraway object is clear)

A

emmertopia

27
Q

nearsighted (eyeball is too long)

A

myopia

28
Q

farsignted (eyeball is too short)

A

hypermetropia (hyperopia)

29
Q

the curvature of the cornea and or the lens being aspherical resulting in different amounts of refraction in different planes and is corrected with cylindrical lens

A

astigmatism

PHSL231 (1 decks)

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