I had a discussion with friends that. One of them who had an eye power of -0.75 has improved and now has an eye power of -0.50 . This happens because he is always wearing spectacles and has a good diet.

Is it really true that spectacles can improve vision? Please provide a full explanation if possible.

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    It seems like you have 2 questions, 1: Can corrective lenses lead to an improvement in eye sight, and 2: Can diet improve eye sight? Are those the two questions or do you mean is there an advantage to the combination? – Atl LED Jan 15 '16 at 3:08
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    The difference between 0.75 and 0.50 is a single step in some shops, so the change could be nothing more than measurement error for someone who needed -0.625 on both visits. – 1-- Jan 15 '16 at 4:35

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