How are myopia and hypermetropia caused?
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Refractive Errors. Refractive errors are imperfections in the eye that prevent light from focusing properly onto the retina, causing blurred vision. Two of the most common types are myopia and hyperopia, better known as nearsightedness and farsightedness.
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The condition is usually caused by an elongation of the eyeball that occurs over time. Farsightedness (hyperopia) is the opposite of myopia, and is usually caused by shortening of the eyeball. Astigmatism is an imperfection of the cornea preventing part of it from focusing light onto the retina.
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