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Biology > The Eye > Flashcards

The Eye Flashcards

1
Q

what is the eye

A

a sensory receptor that detects light

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2
Q

what structures in the eye focus light

A

cornea and lens

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3
Q

what is the hole in the eye where light enters cold

A

pupil

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4
Q

what is the retina

A

the back of the eye where light is focused, has special receptor cells called rods and cones to detect light changes

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5
Q

what is the name of the nerve in the eye

A

the optic nerve

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6
Q

what 2 things control the lens shape

A

suspensory ligaments
ciliary muscles

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7
Q

what shape will the lens be to focus on a nearby object

A

fat and round

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8
Q

what shape will the lens be to focus on far object

A

thin

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9
Q

what happens to the muscles and ligaments in the eye to make the lens fat and round

A

ciliary muscles - contracted
suspensory ligaments - slack

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10
Q

what happens to the muscles and ligaments in the eye to make the lens fat thin

A

ciliary muscles - relaxed
suspensory ligaments - tight

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11
Q

what do cones detect

A

sensitive to bright lights and colours

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12
Q

what do rods detect

A

sensitive to low lights and respond to how dark or light something is

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13
Q

what are 4 eye problems

A

cataracts
colour blindness
long sight
short sight

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14
Q

what is a cataract

A

occurs when the lens becomes cloudy so light cannot properly pass-through

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15
Q

what is a way to treat cataracts

A

artificial lens

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16
Q

what is colour blindness

A

occurs when some types of cone cells are not working

17
Q

why is colour blindness an inherited disease that is mostly in males

A

it is because it is passed on through the X chromosome

18
Q

what is long-sightedness

A

when a person can’t see things close to them
this is because the lens cannot focus the light enough so the image forms behind the retina

19
Q

what is long-sightedness

A

when a person can’t see things far away from them
this is because the lens focuses the light too much so the image forms in front of the retina

20
Q

what lens is used to fix long-sightedness

A

converging

21
Q

what lens is used to fix short-sightedness

A

diverging

Biology (15 decks)

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