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esach88 t1_j0tw0q8 wrote

Reply to comment by BeneficialWarrant in Do babies see mirrors as focused or blurry? by Lord_Poopsicle

Interesting, could mirrors be used to help prevent eye issues from constant near focus? Eg. Needing glasses due to always reading books and using screens and staying indoors.

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BeneficialWarrant t1_j0tzfdh wrote

There isn't any evidence that looking at close up objects causes any permanent harm to eyes.

Losing the ability to focus on close up objects with aging (presbyopia) is just kinda one of those things that happens. The lens slowly becomes less stretchy (elastic) and won't fully snap back into a round shape when tension on it is released.

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rootofallworlds t1_j0utwve wrote

If you want to put the book or screen ten times further away, the letters need to be ten times the size to have the same angular size. That applies whether or not you put flat mirrors you put in the light path.

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