A myopic eye has strong refractive power. Alternatively, you could say it is too long, relatively speaking. In other words, the cornea bends incoming light at too great an angle, making it focus before it gets to the retina. That leaves the light-sensitive retinal cells with less-than-clear image information. They send it on anyway, via the optic nerve to the brain's vision center. The brain has insufficient information to give you a clear image.
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