spherical power

**spherical power**

Spherical power refers to the corrective lens measurement used to address nearsightedness (myopia) or farsightedness (hyperopia) in vision care. It is expressed in diopters (D) and indicates the degree of spherical correction needed to focus light properly onto the retina. A positive spherical power value (+) corrects farsightedness, while a negative value (-) corrects nearsightedness. Understanding spherical power is essential for selecting the right prescription lenses in eyeglasses and contact lenses.