Sense of Vision

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<p>Eye is surrounded by a protective cushion of ____</p>

Eye is surrounded by a protective cushion of ____

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1
<p>Eye is surrounded by a protective cushion of ____</p>

Eye is surrounded by a protective cushion of ____

fat

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2

How much fraction of eye is visible to us

1/6. (Diameter of eye is 1 inch and we can only see 1/6 of it)

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3

_____ is the dominant sense in humans

Vision

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4

____% of sensory receptors are in human eyes

70%

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5
<p>What is a Cornea?</p>

What is a Cornea?

Clear protective layer of eye

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6
<p>What is Iris?</p>

What is Iris?

Colored muscle that changes that amount of light that enters the pupil

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7
<p>What is lens?</p>

What is lens?

Focuses light onto the retina

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8
<p>What is Retina?</p>

What is Retina?

Layer that contains photoreceptors

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9
<p>What is Optic Disc?</p>

What is Optic Disc?

It's a point where retina enters the optic nerve

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10
<p>What is a choroid?</p>

What is a choroid?

Vascular layer that assisting in protecting the eye

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11
<p>What is Sclera?</p>

What is Sclera?

Opaque, protective layer

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12

What does lenses do?

It changes shape to focus light onto the retina

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13
<p>What is Myopia?</p>

What is Myopia?

Light is focused in front of the retina (Nearsightedness). Eyeball is too long.

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14
<p>What is Hyperopia?</p>

What is Hyperopia?

Light is focused behind the lens. Eyeball is too short.

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15

What color does rods distinguish?

Only black and white

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16

What color does Cones distinguish

Colors. (ROYGBIV)

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17

Where are Rods mostly found in the eye?

Thought the retina

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18
<p>Where are Cones found in the eye?</p>

Where are Cones found in the eye?

Highly concentrated at fovea. They are NOT present at periphery vision thus objects appear black and white when you see using periphery vision.

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19
<p>What are the four main parts of Retina?</p>

What are the four main parts of Retina?

Macula, Fovea, Optic Disc and Vessels

<p>Macula, Fovea, Optic Disc and Vessels</p>
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20
<p>What is Macula</p>

What is Macula

darker spot located at the posterior pole

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21

What is Fovea?

Maximal visual acuity (most concentrated cones)

<p>Maximal visual acuity (most concentrated cones)</p>
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22

What is Optic Disc?

"Blind Spot" because there are no photoreceptor cells

<p>&quot;Blind Spot&quot; because there are no photoreceptor cells</p>
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23
<p>What is the function of vessels in the eye?</p>

What is the function of vessels in the eye?

Transfer blood

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24

What is Contralateral processing?

Visual information is processed by the opposite side of the brain from which it enters, ex. right field of vision processed by left side of brain

<p>Visual information is processed by the opposite side of the brain from which it enters, ex. right field of vision processed by left side of brain</p>
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25
<p>What is cataract?</p>

What is cataract?

Clouding of lens due to build-up of proteins.

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26
<p>What is Glaucoma?</p>

What is Glaucoma?

Occurs when there is a problem with drainage and intracellular pressure increases

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27
<p>What happens to eyeball when hyperopia occurs?</p>

What happens to eyeball when hyperopia occurs?

The eyeball gets short

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28
<p>What happens when eyeball when myopia occurs?</p>

What happens when eyeball when myopia occurs?

The eyeball gets long

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29

What is Viterous?

Gel like material that fills the inside of your eye.

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30
<p>What is Retinal Detachment?</p>

What is Retinal Detachment?

Shrinkage or contraction of the vitreous. Can also be caused by a blow the head or due to diabetes.

This shrinkage can create tugging on the retina and a retinal tear, causing retinal detachment.

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