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what do photoreceptors of the eye do?
transduce light energy into an electrical signal that passes to visual cortex for processing
what happens after light enters the eye?
light waves are focused by the lens, whose shape is adjusted by contracting or relaxing the ciliary muscle
what do light-sensitive visual pigments in photoreceptors do?
convert light energy into a change in membrane potential
how does light transmission occur?
via: cornea, lens, rods, optic disc, optic chiasm, lateral geniculate body of the thalamus and visceral cortex of the occipital lobe
what does 20/20 vision mean?
that you can see objects at 20 feet that individuals with normal eyesight can see at 20 feet
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