Bio - The Eye

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Blind spot

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no rods or cones

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choroid

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dark layer, prevents light bouncing around in the eye

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21 Terms

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Blind spot

no rods or cones

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choroid

dark layer, prevents light bouncing around in the eye

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ciliary muscles

adjusts the shape of the lens by pulling on suspensory ligaments

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conjunctiva

transparent membrane, protects cornea

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cornea

refracts light onto the lens

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fovea

concentrated area of cones for a sharp image (in light)

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iris

circular and radial muscles control how much light enters the eye

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lens

focuses light to a point on the retina

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optic nerve

carries nerve impulses to brain

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pupil

allows light to enter the eye

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retina

rods (night vision) and cones (colour vision) convert light into electrical impulses

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sclera

protects the eye from injury

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suspensory ligaments

allow ciliary muscles to change the shape of the lens to focus light

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aqueous + vitreous humors

keep the eye's shape and absorb shocks

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accommodation - near object

ciliary muscles contract, suspensory ligaments loosen, lens becomes more convex, light refracted more

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accommodation - far object

ciliary muscles relax, suspensory ligaments tighten, lens becomes less convex, light refracted less

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pupillary reflex - bright light

radial muscles relax, circular muscles contract, pupil gets smaller, less light enters eye

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pupillary reflex - dim light

radial muscles contract, circular muscles relax, pupil gets larger, more light enters eye

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constriction

pupil gets smaller

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dilation

pupil gets larger

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reason for pupillary reflex

prevents damage to retina in bright light, allows us to see in dim light