SIGHT - a) cones - visual receptor cells that are important...

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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.
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Unformatted text preview: a) cones - visual receptor cells that are important in daylight vision and color vision. the cones work well in daylight, but not in dim lighting. This is why it is more difficult to see colors in low light. most are located in the center of the retina. ..called the FOVEA, which is a tiny spot in the center of the retina that contains ONLY cones. ..visual acuity is best here. SO. ..when you need to focus on something you attempt to bring the image into the fovea. b) rods - visual receptor cells that are important for night vision and peripheral vision. the rods are better for night vision because they are much more sensitive than cones. in addition, the rods are better for peripheral vision because there are many more on the periphery of the retina. The cones are mostly in and around the fovea but decrease as you go out. to see best at night, look just above or below the object. ..this keeps the image on the rods....
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This note was uploaded on 11/14/2011 for the course PSY PSY2012 taught by Professor Scheff during the Fall '09 term at Broward College.

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SIGHT - a) cones - visual receptor cells that are important...

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