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Corrective lens

A corrective lens is a prosthetic lens worn on or before the eye, used to treat myopia, hyperopia[?] and astigmatism[?]. The most common types of corrective lens are spectacle lenses and contact lenses.

In some cases, mild farsightedness can be treated with simple magnifying lenses or "reading glasses". However, an optometrist may need to prescribe a dioptre for both eyes or each eye, allowing lenses to be custom ground to the patient's specific needs. Usually, the dioptre (or "prescription") is equal for both eyes; in some cases, however, the two eyes may need different prescriptions.

Some patients benefit from bifocals[?], or lenses with separate sections ground to different prescriptions for different circumstances.

It is essential for those who wear eyeglasses or contact lenses to consult their optometrists regularly to ensure that their prescription remains constant, especially in the case of children.

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