Myopia is the result of abnormal elongation of the eye, so that light focuses in front of the retina rather than on its surface. Myopia, otherwise known as near- or short-sightedness, is a common type of refractive error. In someone without a refractive error, light rays entering the eye meet and focus on the surface of the retina: the light-sensitive tissue at the back of the eye (Figure 1B). In someone with myopia (Figure 1C), the light focuses at a point in front of the retina, which means that near objects are seen clearly, but objects further away are blurry. This can happen when the cornea is curved too much (is too ‘steep’) or the eye is too long.
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