If you look at eye problems from a conventional ophthalmic point of view, all that is wrong is your eyes, or in many cases your lens. But there is a whole other dimension that this way of thinking doesn't take into consideration.
The picture we actually see with our eyes in not what the eyes perceive. The picture we see at the end of the day is what the mind makes out of the eyes perception.
Basically there are a whole bunch of perceptual filters between all the information your eyes absorb and what is shown to you as picture.
Also, your brain makes one picture out of two, which are perceived by your two eyes. If only the eyes were responsible for the picture we see, then cross-eyed people could never see a single picture, but they do.
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