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The power of a lens for perfect vision, often referred to as emmetropia, is 0 diopters (D). This means that a person with perfect vision does not require corrective lenses for clear sight at any distance. In contrast, lenses with positive power correct for hyperopia (farsightedness), while negative power lenses correct for myopia (nearsightedness). Thus, perfect vision indicates that the eye's optical system is properly aligned and focused.

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4d ago

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