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the rounded, transparent

covering over the front of

your eye.

As the light waves pass

through the cornea, its

curved surface bends, or

focuses, the waves into a

narrower beam.

round opening at the

front of your eye that

allows light waves to

pass into the eye’s

interior.

circular muscle that

surrounds the pupil

and controls the

amount of light

entering the eye.

contains the

pigment that gives your eye its

characteristic color.

constricts,

allowing less light to enter—the pupil

constricts.

allowing more light to enter—the

pupil dilates

a transparent, oval

• - structure whose curved

surface bends and focuses

light waves into an even

narrower beam.

a located at the very back of the eyeball, is a thin film that contains cells that a e extremely sensitive to light.

- light-sensitive cells

-begins the process of transduction by absorbing light waves

are extremely light sensitive, they

allow us to see in dim light, but to see only black, white,

and shades of gray.

are photoreceptors that contain a single chemical,

called rhodopsin, which is activated by small amounts

of light.

begins when chemicals in the rods and cones break down after absorbing light waves. This chemical breakdown generates a tiny electrical force that, if large enough, triggers nerve impulses in neighboring ganglion cells