Answer: Nearsightedness or myopia, farsightedness or hyperopia and astigmatism are three common refractive errors of the eye that cause blurred vision.
Hyperopia results either from the eye being short or the cornea being too flat. In either case the hyperopic or farsighted eye focuses light behind the retina resulting in blurred vision whereby objects and images up close are blurred-and objects that are far away are clearer.
Astigmatism typically results from the cornea being unequally curved vertically as compared to horizontally so that it is shaped more like a football rather than a basketball.
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