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In page Contact lens:
"Prescriptions for contact lenses and glasses may be similar but are not interchangeable. Prescribing of contact lenses is usually restricted to various combinations of ophthalmologists, optometrists and opticians. An eye examination is needed to determine an individual's suitability for contact lens wear. This typically includes a refraction to determine the proper power of the lens and an assessment of the health of the eye's anterior segment. Many eye diseases inhibit contact lens wear, such as active infections, allergies, and dry eye.[1] Keratometry is especially important in the fitting of rigid lenses.[citation needed]
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