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What is the difference between + and - power of human eye?

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I am looking for the detail answer for the difference between + and - power in the human eye and how to control that power?

posted Mar 22, 2017 by anonymous

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1 Answer

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The plus(+) powers mean either hyperopia (which is shorter length of eyeball than normal length)
Minus(-) powers mean that your eyeball is longer than normal (myopia).
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If a person has -0.5 refers to the power of the lens. It implies you are very slightly nearsighted (it's difficult for you to focus on things that are far away); this is known as myopia.
otherwise if you have +0.5 It implies you are very slightly farsighted.

answer Apr 22, 2017 by Munni Narang
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