6th grade Science - chapter 4.4

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how do you see objects?

...a process that occurs that involves both your brain and your eyes

cornea

..., the transparent front surface covering of the eye where light enters

pupil

..., the adjustable opening in the center of the eye through which light enters

iris

...ring of muscle that contracts and expends to change the size of the pupil

retina

...layer of cells that lines the inside of the eyeball

rods

...cells that contain a pigment that responds to small amounts of light

cones

...cells that respond to color

optic nerve

...a thick neve that the rods and cones send signals to the brain through

nearsighted

...a person that can see nearby things clearly, but objects at a distance are blurred

farsighted

a person that can see distant objects clearly, but nearby objects appear blurry...

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