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Page 146 text:
“
OUNG established a definite period in optical history. His discovery of astigmatism made possible the applica- tion of corrective refractive science in one of the most common fields of defective vision. Dr. Young examined his own eyes in a mirror. l-le per- formed 'his experiments largely through the then newly invented instrument, the optometer. l-le succeeded in determining the focal length of the lens of his eye in various meridians. l-le made the important discovery that his eyes did not pos- sess equal power in focusing lines at different inclinations to the horizontal, e. g., when he viewed horizontal lines of square paper the vertical lines were not clearly in focus, and vice versa. l-lis account was the first written record of astigmatism. Young not only told of his discovery but he proceeded to account for his defect in such exacting scientific language that even the most recent works on the subject have not changed the basic ideas of his treatises to any great extent. The modern optometrist is indebted to Thomas Young for much enlightenment on the science of optics, but the greatest practical application of the famous scientist's knowledge and genius lay in his discovery of astigmatism. iCourtesy of Optical journal and Review of Optomctryl
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Page 145 text:
“
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