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24 Cards in this Set
- Front
- Back
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ciliary muscle |
changes thickness of lens when focusing |
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conjunctiva |
extension of sclera helps protect the eye from bacteria |
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cornea |
bends light rays entering the eye helps protect the eye |
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aqueaous humor |
watery liquid filling the front of the eye |
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pupil |
allows light to enter the eye |
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lens |
can change it's shape to focus light on the retina |
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iris |
controls the intensity of light entering the eye through the pupil |
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suspensory ligaments |
hold the lens in place |
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sclera/sclerotic |
protective layer, helps the eye keep it's shape |
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optic nerve |
carries nerve impulses to the brain |
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blind spot |
doesn't contain any light-sensitive nerves |
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yellow spot/fovea |
most sensitive part of the retina, can see the sharpest |
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retina |
light-sensitive layer containing rod and cone cells, sends messages to the brain |
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vitreous humor |
jelly-like substance, supports the lens and keeps the retina in place |
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choroid |
absorbs light and stops reflection, contains blood vessels to help nourish the retina |
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anterior chamber |
prevents the cornea and iris from sticking together |
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posterior chamber |
prevents the iris and lens from sticking together |
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pigmented layer |
prevents internal reflection in the eye |
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photoreceptor types |
rods cones |
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rhodopsin |
contains retinal and opsin bleaches (changes shape) when it absorbs light --> rods become unresponsive |
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visual pigments rod cells |
black white grey |
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visual pigments cone cells |
yellow blue red |
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rod cells function |
see in dim light |
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cone cells function |
distinguishing color |
