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.
Read more about Human Eye: General Properties, Dynamic Range, Field of View, Eye Irritation, Eye Movement, Near Response, Effects of Aging, Eye Care Professionals
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“I should say tact was worth much more than wealth as a road to leadership.... I mean that subtle apprehension which teaches a person how to do and say the right thing at the right time. It coexists with very ordinary qualities, and yet many great geniuses are without it. Of all human qualities I consider it the most convenient—not always the highest; yet I would rather have it than many more shining qualities.”
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