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What is the difference between hypermetr...

What is the difference between hypermetropia and presbyopia ?

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Hypermetropia is long sightedness. It may be due to contraction in size of the eye ball or increase in focal length of eye lens, when fully relaxed. Presbyopia is long sightedness due to old age when eye ball has normal length. Only the focal length of eye lens in fully relaxed position has increased.
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