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what is emmetropia
myopia
hyperopia
myopia
hyperopia
Normal vision is known as emmetropia. If the eyeball is too long, a distant object is focused in front of the retina, resulting in myopia, or short-sight, which is corrected using a diverging lens. If the eyeball is too short, near objects are focused behind the retina, resulting in hyperopia (previously known as hypermetropia) or long-sight, which is corrected with a converging lens.