12.1 Information Flashcards

1
Q

Vision problems

A

Age can affect the ability to focus

Can be fixed by a lense

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2
Q

Far sightedness

A

Hyperopia
Can see close objects but not far objects
Light entering is focused on the retina and not directly on it
Eye cannot make the lense thick enough
Fix place converging convex lense

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3
Q

Near sightedness

A

Mytopia
Can see close objects clearly but not distant objects
Light entering is focused in front of the retina not directly on it
Eye can’t flatten lense to project
Place diverging I cave lense in front of eye

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4
Q

Astigmatism

A
Inability of the eye to form a clear image due to an irregularly shapes lense/cornea 
Cornea shapes like an oval or football 
Light focuses on more than one point 
2 types horizontal and vertical 
Causes headaches and fatigue 
Fix glasses contacts laser surgery
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5
Q

Laser eye surgery

A

Involves correcting vision by reshaping the cornea using energy from a laser

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6
Q

Laser eye surgery benefits

A

Can correct near and far sightedness and astigmatism millions of success stories

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7
Q

Laser eye surgery risks

A

Poor night vision
Dry eyes
Long term effects are unknown

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8
Q

Total blindness

A

The person can not detect any light at all

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9
Q

Legally blind

A

People with very low vision or substantially reduced field of view
Can detect some light
Can form some image
Visual field is less than 20 instead of less than 180

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10
Q

Low vision

A

Most people can have most of their sight restored by glasses lenses or surgery

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11
Q

Lens capsule

A

An elastic bag that is like a bag that holds the lens in place

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12
Q

Cataract surgery

A

Front portion of the lens capsule is gently opened to remove the cataract
Cataractvis gently Brocken apart using ultrasonic vibrations
Cataract is vacuumed out
Lens capsule is left undistirved and tiny lens implant is inserted

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13
Q

Glaucoma

A
Caused by a buildup of vitreous humour fluid 
Fluid pressure collapses blood vessels 
No constant supply of oxygen 
Nutrients and neutrons dies 
Peripheral vision loss is tunnel vision
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14
Q

True colour blindness

A

Ability to only sheenshades of grey rare 1 in 40000

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15
Q

Colour vision defiexienxh

A

Ability to distinguish some colours but not others 1% females 8% males

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16
Q

Red green colour deficiency

A

Red and green appear to be the same colour

Lack of red cone cells

17
Q

Dyslexia

A

Perceptual condition difficulty to read and spell words