A person looking at a net of crossed wires is able to see the vertical direction more distinctly than the horizontal wires. What is the defect due to? How is such defect of vision corrected?
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This defect is due to a condition called as astigmatism. Here the person is not able to see the horizontal lines, so that is due to the problem in the refracting system of the eye which includes the cornea and the eye lens. This defect can be corrected by using cylindrical lenses.
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