Why does one eye become weaker than the other?

Why does one eye become weaker than the other?
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What does weaker mean? One eye sees better all together, or one eye sees things far away better? One is 20/20 and the other is 20/10? All I know is I masturbate with both hands so I’ve needed corrective lens for years cause both eyes are weak. fun note: I wear contact lenses of different strengths so I don’t need bi-focals. They are called mono-vision lenses and work great!
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