Module 18-1 Flashcards
The distance from the peak of one light or sound wave to the peak of the next
wavelength
the amount of energy in light or sound wave
intensity
how we perceive as brightness or loudness, as determined by the wave’s
amplitude
the adjustable opening in the center of the eye through which light enters
the pupil
a ring of the muscle tissue around the pupil controls the size of the pupil opening
iris
the transparent structure behind the pupil changes shape to help focus images on the retina
lens
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
the retina
the process by which the eye’s lens changes shape to focus near or far objects on the retina
accommodation
Each___is is so distinctive that an iris scanning machine can confirm your identity.
iris
Why don’t we see it upside down?
The retinal doesn’t see a whole image. Rather its millions of receptor cells convert particles of light energy into neural impulses and forward those to the brain. There the impulses are reassembled into a perceived upright seeming image.
retinal receptors that detect black, white, and gray, necessary for peripheral and twilight vision, when cones don’t respond
rods
retinal receptors cells that are concentrated near the center of the retina and that function in daylight or well-lit conditions. The cones detect fine detail and give rise to color sensations.
cones
the nerve that carries neural impulses from the eye to the brain
optic nerve
the point at which the optic nerve leaves the eye, creating a “blind” spot because no receptor cells are located there
blind spot
the central focal point in the retina, around which the eye’s cones cluster
Fovea
