Sight is the power or faculty of seeing; visual perception of objects. For humans, the organ of vision is the eye where light rays reflected from objects are passed first to our cornea where it will be slightly refracted into our pupil. Our pupil can then control the amount of light that can pass through to help maintain image quality. Then the light rays are further focused by our lens into the rods at the back of the eye. These rods help process the light rays into electrical impulses to be sent to the brain. This makes the eye with no doubt the most complex sensory organ.
In the modern world of today, sight is perhaps the most important sense of all as I believe it is needed to get on with every day life. However there are people who cannot see because of various reasons such as sickness or genetic defects. Fortunately, most societies with its moral beliefs and values has helped and allowed the blind to contribute to society.
Source: http://www.nfb.org/, Encarta 2005, http://www.wikipedia.org/
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