Definitions
sight, taste, touch, smell, and hearing
transparent protective coating over the front of the eye
cornea
the light-sensitive inner lining of the back of the eyeball; contains receptor cells
Retina
the smallest difference between two stimuli that is detectable 50 percent of the time
JND or Difference Threshold
small opening in the center of the iris; color part of the eye
Pupil
visual receptor cells; located in retina; 8 million in each eye; works best in bright light; chiefly responsible for viewing color; greatest density in the fovea
Cones
tendency of sensory receptor cells to become less responsive to a stimulus that is unchanging
the color part of the eye; made of muscle that contracts/relaxes to control the size of the people allowing light to enter the eye
iris
located on retina, directly behind lens; is a depressed spot; Center a visual field; images are sharpest here; contains mostly cones
Fovea
the process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events
Perception
transparent part of the eye behind the iris; focuses light on the retina; change shape to focus on objects;-if object is closed, muscles attach to the land contract to make lens around,-if object is far away, the muscles pull to flatten the lens
lens
bundle of axons from ganglion cells that carries no messages from the eye to the brain
Optic Nerve
the process that occurs when special receptors in the sense organs are activated, allowing various forms of outside stimuli to become neural signals in the brain
Sensation
visual receptor cell; located in retina; 120 million in each eye; respond to varying degrees of light and dark; chiefly responsible for night vision and perception of brightness
Rods
place on the retina out where the ganglion cells axons leads the eye; no receptors fantasy rods/cones) are located here
Blind Spot
HINT:(When you're driving and you cannot see a specific spot)