Explain why a person can have an astigmatism with either myopia or hyperopia, but cannot have both myopia and hyperopia at the same time.
I know why myopia and hyperopia can't occur together, but I don't know about the astigmatism. My book is sort of vague.
I know why myopia and hyperopia can't occur together, but I don't know about the astigmatism. My book is sort of vague.
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