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Myopia, or Near-Sightedness, is a refractive defect of the eye in which collimated light produces image focus in the front of the retina when accommodation is relaxed. To treat myopia, doctors prescribe corrected lenses, that are concave, with a negative optical power. This is to counter the excessive positive diopters of the myopic eye. Hyperobia, or Far-sightedness, is a defect of vision caused by an imperfection in the eye, (often when the eyeball is too short or the lens cannot be round enough), causing difficulty in viewing near objects. This is usually corrected by doctors with lenses a positive diotropic value, (convex lenses), to cause the light to focus closer to the normal point.