Franciscus Cornelis Donders was a #Dutch #ophthalmologist, the most eminent of 19th-century Dutch…
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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.
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