Vision and Perception

Front

Wavelength

Back

The distance between two corresponding parts of a wave

Front

Hue

Back

The dimension of color that is determined by the wavelength of light; what we know as the color names blue, green, and so forth

Front

Intensity

Back

The amount of energy in a light or sound wave, which we perceive as brightness or loudness, as determined by the wave's amplitude

Front

Cornea

Back

The clear tissue that covers the front of the eye

Front

Pupil

Back

The adjustable opening in the center of the eye through which light enters

Front

Iris

Back

A ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening

Front

Lens

Back

The transparent structure behind the pupil that changes shape to help focus images on the retina

Front

Retina

Back

The light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information

Front

Accommodation

Back

The process by which the eye's lens changes shape to focus near or far objects on the retina

Front

Rods

Back

Retinal receptors that detect black, white, and gray; necessary for peripheral and twilight vision, when cones don't respond