PSYC 2390 Chapter 3: Chapter 3
24 Jan 2012
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Document Summary
Vision is based on visible light, which is a band of energy within the electromagnetic spectrum produced by electric charges and is radiated as waves. Can be described by its wavelength (distance between the peaks of the electromagnetic waves) which range from extremely short-wavelength gamma rays to long-wavelength radio waves. Visible light is what humans can perceive, having wavelengths ranging from 400 to 700 nanometers. Light can also be describes as consisting of small packets of energy called photons, with one being the smallest unit. Myopia, or nearsightedness, is the inability to see distant objects clearly affects 70 million. Move the stimulus closer the distance at which the spot of light becomes focused on the retina is called the far point, when the spot of light is at the far point, a myope can see it clearly. A person with hyperopia, or farsightedness can see distance objects clearly but has trouble seeing nearby objects.
