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What is Spherical (SPH)? ( Helpful:2 ) Back »

The value for SPH indicated the power of the lens measured in diopters (D) required for correcting vision. The minus sign (-) indicates the use of a concave lens to correct nearsightedness. The plus sign (+) indicates the use of a convex lens to correct farsightedness. The lens refracts light to the retina to allow the greatest visual acuity.

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