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Physio B > Vision 1 > Flashcards

Vision 1 Flashcards

1
Q

This type of spherical lens will converge light rays

A

Convex

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2
Q

This type of spherical lens will diverge the light rays

A

Concave

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3
Q

This type of lens will give you a focal line

A

Cylindrical

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4
Q

If you increase the power of the lens, it will give you what kind of focal length

A

Shorter focal length

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5
Q

Power of the lens is determined by what unit

A

Diopter

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6
Q

Refractive power of spherical convex lens will give you

A

A positive power

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7
Q

If you have 10 diopter, the focal point is

A

Nearer to the lens

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8
Q

It can dilate and constrict to control how much light can enter

A

Pupil

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9
Q

This is where the object will be registered

A

Retina

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10
Q

Is has the highest capability of bending light rays or highest refractive power

A

Cornea

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11
Q

This holds the lens to maintain its shape

A

Suspensory ligament

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12
Q

What happens if the suspensory ligament is tight or tense

A

It would decrease the convexity

Decrease the power of the lens

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13
Q

If the ciliary muscles contracts what will happen to the lens

A

The lens would be more convex

Increase the power of the lens

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14
Q

This condition is called loss of accommodation by the lens

A

Presbyopia

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15
Q

Normal vision is called

A

Emmetropia

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16
Q

Causes of hyperopia

A

Weak lens

Small eyeballs

17
Q

What lenses do you give when the px has hyperopia

A

Convex

18
Q

Causes of myopia

A

Growing eyeballs

Increases thickness of the lens

19
Q

What type of lens do you give to px with myopia

A

Concave

20
Q

This condition has an irregular shaped cornea

A

Keratoconus

21
Q

The part of the retina has highest visual acuity

A

Fovea centralis

22
Q

In depth perception, the person perceives 3 majors means

A

Size of the image of known object
Moving parallax
Stereopsis

23
Q

The perfect vision is said to be what in meters

A

6meters by 6 meters

24
Q

Which organ secretes aqueous humor

A

Ciliary process

25
Q

Where does the aqueous humor drain

A

Canal of schlemm

26
Q

What are the reasons of increased intraocular pressure

A

Blockage of the canal of schlemm

Old age (fibrotic canal)

27
Q

What are the photoreceptors of the eyes

A

Rods and cones

28
Q

This is responsible for vision at low light levels (scotopic vision)

A

Rods

29
Q

Responsible for color vision and responds well to bright light (photopic vision)

A

Cones

30
Q

Besides the horizontal cells, what other cells can perform lateral inhibition

A

Amacrin

Bipolar cells

31
Q

Rhodopsin or visual purple is for what

A

Rods

Black and white

32
Q

Cone pigments or color pigments are for what

A

for the cones

For color vision

33
Q

Metarhodopsin 2 is also known as and it is broken down into what

A

The activated rhodopsin

Scotopsin and all trans retinal

34
Q

What happens there is a high cGMP

A

Sodium influx

Physio B (9 decks)

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