Biology - eye

What type of receptor is the eye?
Sensory receptor
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The eye has receptors that are sensitive to...
Light intensity and colour (light waves)
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What is the sclera?
Tough & supporting outer layer of eye
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What does it do? (purpose)
protects eye
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What's the cornea?
Transparent outer layer at front of eye
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what's its purpose?
Refracts/bends light into eye
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What's the pupil?
dark hole in middle, where light enters eye
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What's the name of the coloured part of the eye?
Iris
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It contains muscles that d__ and c__ pupil (make wider and smaller)
dilate and constrict
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it controls...
amount of light that enters eye
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What does the lens do?
Focuses light onto retina
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It becomes fatter to focus on ____ objects (closer? further?)
Closer
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And becomes ___ to focus on objects further away
Thinner
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What's the suspensory ligament connects the cillary muscle with the __
lens
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It holds the __ in place
lens
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What do they do?
Control shape of lens
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What's the retina?
Layer of receptor cells found at back of eye
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They detect changes in ___ and convert it to ___
light. impulses
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The optic nerve leads away from the eye. It carries ___ from the retina
impulses
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Why is it important to limit light that enters eye?
it can damage the retina
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Why is it important to let as much light in a possible when it's dark?
so we can see
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What controls how much light gets in eye?
Muscles in iris
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What happens to eye in bright conditions?
Circular muscles contract. Radial muscles relax. causing pupil to constrict to reduce light
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Muscles work in pairs, when one contracts, the other relaxes. So what would the muscles do in dark conditions?
Circular relax. Radial contract.causing pupil to dilate to increase light
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What two parts of the eye are involves in focusing?
Lens and cornea
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Light rays are sent out to eye when you look at something. They enter the cornea and is re___
refracted
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It's refracted further as it goes through the ___ so they meet at point on r__ (at back of eye)
lens. retina
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These rays have now been ___ to form an image
focused
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Accommodation is where a lens changes shape to...
focus on a far/near object
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When focuses on near object, the cillary muscles ___ and the suspensory ligaments ___
cillary contracts. suspensory ligaments loosen
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This means the lens becomes __ and refracts light more strongly/weakly?
thicker. more strongly
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What does myopia and hyperopia mean?
myopia = short-sighted. hyperopia = long-sighted
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Why are some people long-sighted
Eyeball is too short or cornea is too flat, meaning light is focused behind retina instead of onto it
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___ lens are used to bend light before they reach eye to focus on retina
convex
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Why are some people short-sighted?
Eyeball is too long or cornea too curved so light is refracted too strongly so rays meet in front of retina, not on it
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___ len spread light out to focus on retina
concave
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Inproper use of contact lenses can risk...
eye infection
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Lazers can reshape the __ and change how it refracts light
cornea
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Other cards in this set

Card 2

Front

The eye has receptors that are sensitive to...

Back

Light intensity and colour (light waves)

Card 3

Front

What is the sclera?

Back

Preview of the front of card 3

Card 4

Front

What does it do? (purpose)

Back

Preview of the front of card 4

Card 5

Front

What's the cornea?

Back

Preview of the front of card 5
View more cards

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