The human eye is an organ which reacts to light for several purposes. As a conscious sense organ, the mammalian eye allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors.
In common with the eyes of other mammals, the human eye's non-image-forming photosensitive ganglion cells in the retina receive the light signals which affect adjustment of the size of the pupil, regulation and suppression of the hormone melatonin and entrainment of the body clock.
Other articles related to "human eye, eye, human":
... angular span (vertically and horizontally), within which the human eye has sharp enough vision to read text ... The visual field of the human eye spans approximately 120 degrees of arc ... The human eye has much greater resolution in the macula, where there is a higher density of cone cells ...
... There is no evidence from eye movement research that individuals are making predictions of text based upon hypotheses about the words in the periphery so that they can skip over or spend less time on ... At best the human brain can only guess at the content of text outside the macular region ... Some speed reading courses stress that the human eye has to move very quickly ...
... luminous efficiency function describes the average visual sensitivity of the human eye to light of different wavelengths ... the photopic luminosity function best approximates the response of the human eye ... For low light levels, the response of the human eye changes, and the scotopic curve applies ...
... produce a spectral color, as the eye cannot distinguish them from single-wavelength sources ... appears orange because the red and green are mixed in the right proportions to allow the eye's cones to respond the way they do to the spectral color ... that have the same effect on the three color receptors in the human eye will be perceived as the same color ...
Famous quotes related to human eye:
“If there is a look of human eyes that tells of perpetual loneliness, so there is also the familiar look that is the sign of perpetual crowds.”
—Alice Meynell (18471922)
“Let me look into a human eye; it is better than to gaze into sea or sky; better than to gaze upon God.”
—Herman Melville (18191891)
“What a wonderful phenomenon it is, carefully considered, when the human eye, that jewel of organic structures, concentrates its moist brilliance on another human creature!”
—Thomas Mann (18751955)