Hyperopia, also known as hypermetropia or colloquially as farsightedness or longsightedness, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short or when the lens cannot become round enough), causing inability to focus on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves towards the eye, the eye must increase its power to keep the image on the retina. If the power of the cornea and lens is insufficient, as in hypermetropia, the image will appear blurred.

People with hyperopia may experience blurred vision, asthenopia, accommodative dysfunction, binocular dysfunction, amblyopia, and strabismus.American Optometric Association. Optometric Clinical Practice Guideline: Care of the patient with hyperopia. 1997.

Classification of hyperopia

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Hyperopia is typically classified according to its clinical appearance, its severity, or how it relates to the eye's accommodative status.

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