There seems to be an exact point where you lose focus on an item when bringing it closer to your face. The closer it gets, the blurrier it gets – even with only one eye open. Why is this?
In: Biology
Your eye lens has to adjust shape in order to change focus. It would have to adjust to infinite curvature in order for it to focus on something touching the front of your eye. For things super close to your eye, it has to adjust to extremely high curvatures and eventually can’t go any further.
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