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What causes asthenopia?

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Staring at a computer screen long periods or straining to dim light are common causes.
User XerXes
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Answer:

Asthenopia is more commonly known as eyestrain or ocular fatigue. It's a common condition that occurs when your eyes become tired from intense use. Staring at a computer screen for long periods or straining to see in dim light are common causes.

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User Amaneureka
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