SIGHT/VISION A) the visual system works on sensing and perceiving light waves. Light waves vary in their length and amplitude:a) wave length (also referred to as frequency, since the longer a wave, the less often/quickly it occurs) - affects color perception (ex., red=approx 700, yellow approx 600)b) wave amplitude (this is the size/height of the wave) - affects brightness perception.B) Structure of The EYE:1) Cornea - the round, transparent area that allows light to pass into the eye.2) Lens - the transparent structure that focuses light onto the retina.3) Retina - inner membrane of the eye that receives information about light using rods and cones. The functioning of the retina is similar to the spinal cord - both act as a highway for information to travel on.4) Pupil - opening at the center of the iris which controls the amount of light entering the eye. Dilates and Constricts.5) Rods & Cones - many more rods (approximately 120 million) than cones (approx 6.4 million).
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