Progressive lens

Progressive lenses are corrective lenses used in eyeglasses to correct presbyopia and other disorders of accommodation. They are characterised by a gradient of increasing lens power, added to the wearer's correction for the other refractive errors. The gradient starts at the wearer's distance prescription at the top of the lens and reaches a maximum addition power, or the full reading addition, at the bottom of the lens.

The length of the progressive power gradient on the lens surface depends on the design of the lens, with a final addition power between 0.
75 and 3.
50 dioptres.

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