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Neuro > Visual > Flashcards

Visual Flashcards

1
Q

What does the visual system provide?

A

Sight
Processing of visual info for recognition and location of objects
Eye mvmt
Info used in postural and limb mvmt control

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2
Q

What is the role of the cornea?

A

Allows light to pass through

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3
Q

What is the role of the sclera?

A

Protection

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4
Q

What is the role of the aqueous humor?

A

Fluid protects cornea and lens

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5
Q

Is the cornea avascular

A

Yes

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6
Q

What is the role of the lens?

A

Refracts light onto the retina
Always changing curvature (dynamic structure)

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7
Q

What is the role of the iris?

A

Controls amount of light on the lens

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8
Q

What is the role of the ciliary muscle?

A

Controls the curvature of lens

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9
Q

What is the vitreous humor?

A

Clear gel
Let’s the light fall onto the retina

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10
Q

Why do we see “floaters”?

A

Light is further refracted by the vitreous humor
Gel in vitreous humor is not clear

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11
Q

Where do we want the light to fall?

A

Retina

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12
Q

What receptors are in the eye?

A

Photoreceptors

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13
Q

What is the most sensitive to light?

A

Fovea

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14
Q

What can we see with the fovea?

A

Color
Amount of light
Clarity of image

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15
Q

Where do we want the focal point to end up?

A

On the retina

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16
Q

What are the types of photoreceptors?

A

Rods
Cones

17
Q

Which photoreceptors are MOST sensitive to light?

A

Rods

18
Q

Which photoreceptors are important for nighttime vision?

A

Rods

19
Q

Which photoreceptors are responsible for seeing color?

A

Cones

20
Q

Examples of refractive errors?

A

Myopia
Astigmatism
Hyperopia
Presbyopia

21
Q

What is a form of hyperopia due to aging?

A

Presbyopia

22
Q

What is there is a cut at right optic nerve?

A

Blind in right eye

23
Q

What if there is a cut at the optic chiasm?

A

Bitemporal hemianopia

24
Q

What if there is a pituitary tumor on the optic chiasm?

A

Bitemporal hemianopia

25
Q

What if there is a cut at the right optic tract?

A

Can’t see on the left eye

Neuro (19 decks)

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