Glasses sphere
By Isabella Sara Novack
Reviewed by
Maria Horan FBDO
Maria holds a BSc Honours in Ophthalmic Dispensing and has over 17 years of optical experience.
Glasses sphere - The part of your glasses prescription that indicates the strength of lens power required to correct nearsightedness (myopia) or farsightedness (hyperopia). The sphere (SPH) value is measured in diopters, with a minus sign (-) denoting myopia and a plus sign (+) indicating hyperopia.
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