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The Human Eye (Pupil Reflex (controls the amount of light entering the eye…
The Human Eye
Pupil Reflex
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stimulus -> receptor (retina) -> sensory neuron in optic nerve -> brain -> motor neuron -> effector (iris)
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Rods
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when the eye is exposed to bright light, all the visual purple is bleached
upon movement from a brightly-lit room to a dimly-lit room, visual purple needs to be formed again and it takes some time
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a person deficient in Vitamin A maybe unable to see in dim light & is said to suffer from night blindness.
Cones
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three types of cones: red, blue & green cones
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Accommodation
adjustment of the lens of the eye so that clear images of objects at different distances are formed on the retina
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