Title. I mean I can’t be the first one who thought of this. A filter on your phone so that you don’t need to wear glasses to read or view pictures would be awesome.
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Yay optics!
So your eyes are built like cameras using two parts: a lens and a detector (your retina). Now, the goal is to have your lens focus a clear image of what you’re looking at exactly on your retina. If, unfortunately, your eye is a bit weirdly shaped, the spot where the image is focused is not on your retina: you see an unfocused =blurry image. This means that instead of a small section of the image hitting exactly one of your retina cells, you have multiple sections hitting multiple cells and generating a very blurry picture. Depending on your eye problem, you may struggle to focus images that are far away, or images that are close to you. In any case, you’re going to use glasses that will help with focusing the image on your retina by adjusting your lens. That’s the critical part. If you hold your glasses away, you won’t see clearly just in the small square. Everything will be blurry because the images aren’t focused on your retina anymore.
In this way, you cannot have a glasses app, since your phone won’t be able to project the images directly focused on your retina. Instead, you’ll see a blurry image even more blurred.
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