BPK 142 Study Guide - Retinal Ganglion Cell, Visual Acuity, The Blind Spot
3 Dec 2013
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Document Summary
The visual system extends from the eye to the brain. People with color blindness are impaired in the perception of hue: about 8% of males and 0. 5% of females exhibit some degree of color blindness. Complete color blindness is therefore extremely rare: the apparent brightness of visual objects is subject to modification by the visual system; for example, interactions between neighboring retinal cells can enhance contrast at the boundaries of patches. The process that acts to enhance boundaries is called lateral inhibition: the visual system responds to electromagnetic radiation. In humans, the eyes detect quanta of light energy, called photons, within a very narrow range of wavelengths, ranging from. 400 to 700 nanometers (nm): the blind spot is located laterally from the point of fixation for each eye and corresponds to the location at which the optic nerve exits the eye (called the optic disc).
