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Seeing Light

Across
is a ring of muscle that contracts and expands to change the size of the pupil.
person can see nearby things clearly, but objects at a distance are blurred.
protects the eye and acts as a lens to help focus light rays.
bends light to form an upside-down image on the retina.
Down
contain a pigment that responds to small amounts of light.
is a layer of cells that lines the inside of the eyeball.
is an opening through which light enters the inside of the eye.
respond to color. They detect red light, green, or blue light.
person can see distant objects clearly, but nearby objects appear blurry.