Front

Pupil

Back

Hole in centre of iris; allows light to enter the eye

Front

Muscles in the iris

Back

Circular and radial muscles

Front

Transparent, circular, and biconvex structure

Back

Lens

Front

Greatest concentration of photoreceptors

Back

Fovea

Front

Photoreceptors

Back

Receptors that detect light changes.

Front

What happens to the eye in bright light?

Back

-circular muscles contract

-radial mucles relax

-pupil decreases

Front

What happens to the eye in dim light?

Back

-circular muscles relax

-radial mucles contract

-pupil dilate

Front

when looking at a distant object...

Back

-Ciliary muscles relax

-suspensory ligaments taut

-lens less convex

Front

when looking at a near object...

Back

-Ciliary muscles contract

-suspensory ligaments slacken

-lens more convex

Front

Distant vision process

Back

Involves relaxation of ciliary muscles and taut suspensory ligaments.