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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People haven’t thought of that because it wouldn’t work. People who need glasses have a problem with their lenses such that they are not making sure light falling on one patch of the retina only comes from one direction. The result is blurry vision. There is no way to twist around the display on a smartphone that would solve this problem because they still cannot ensure only light from one part of the display hits a particular part of their retina.
As for people who can see clearly at short distance but longer distances are blurry, they can still view the smartphone screen clearly. There is no filter required as the normal images passed through the smartphone are viewable. They are using the lens of the smartphone to view distant things.
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