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| Description: A. In the emmetropic (normal) eye, light is focused properly on the retina, and the 0 diopter is used. B. In the myopic eye, light from a distant source converges to a focal point before reaching the retina. Negative diopter numbers are used. C. In the hyperopic eye, light from a near source converges to a focal point past the retina. Positive diopter numbers are used.
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