Foveal

The foveal system of the human eye is the only part of the retina that permits 100% visual acuity. The line-of-sight is a virtual line connecting the fovea with a fixation point in the outside world. The discovery of the line-of-sight is attributed to Leonardo da Vinci. His main experimental finding was that there is only a distinct and clear visi...
Found on http://en.wikipedia.org/wiki/Foveal
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