Vision - Vision Light 01:08:00 Quanta electromagnetic...

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Vision 08/02/2009 02:08:00 Light Quanta – electromagnetic radiation that comes in very small packets Wavelength – each quantum can be describe by the distance between two  adjacent crests of vibratory activity o Long wavelength -> slow frequency -> red o Short wavelength ->fast frequency -> blue Photon – the human visual system responds only to quanta whose  wavelengths lie within a very narrow section of the total electromagnetic  range Human Eye Iris – circular bands of contractile tissue that gives eye its color Pupil – hole formed by iris; allows light to enter the eye o when environment is brightly lit and sensitivity is not important, the  pupil constricts to enhance acuity o sensitivity – ability to detect the presence of objects o acuity – ability to see details of objects o when environment is dimly lit, pupils dilate to increase sensitivity and  sacrificing acuity cornea – transparent outer layer of eye; the curvature is fixed; bends light  rays, and is responsible for forming the image on the retina lens – transparent structure behind pupil that focuses light on retina ciliary muscles – muscles that control the shape of lens o when object is close, muscles make lens become more cylindrical;  objects come into sharper focus o when object is distant, muscles make lens flatten to focus on an object o process called accommodation binocular disparity – slight difference between views from the two eyes;  important for depth perception retina – receptive surface inside eye that contains rods and cones fovea – small depression in retina that has a dense concentration of cones 
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