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Find number abc

If 5cb0b - 2b1ba = 2561a find number abc. Multiple solutions may exist.

Correct answers: 10

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Frans Cornelis Donders

Born 27 May 1818; died 24 Mar 1889 at age 70.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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