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Kate T Medve

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Frans Cornelis Donders

Died 24 Mar 1889 at age 70 (born 27 May 1818).Franciscus Cornelis Donders was a Dutch ophthalmologist, the most eminent of 19th-century Dutch physicians, whose investigations of the physiology and pathology of the eye made possible a scientific approach to the correction of refractive disabilities such as nearsightedness, farsightedness, and astigmatism. He found (1858) that hypermetropia (farsightedness) is caused by a shortening of the eyeball, so that light rays refracted by the lens of the eye converge behind the retina. He discovered (1862) that the blurred vision of astigmatism is caused by uneven and unusual surfaces of the cornea and lens, which diffuse light rays instead of focusing them.

8 planets

8 planets,204 countries,809 islands,7 seas,6.000.000.000 people,and i am still single.
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