Progressive lens for specialty and occupational use
AssigneeGentex Optics, Inc.
InventorRichard P. Waido
Life of this patent
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Abstract
A progressive addition lens constructed on the bipolar principle in accordance with a power law having a steeper slope or gradient in the regions adjacent to the poles than in the middle region thereof between the poles.
Claims11
A lens having near vision and far vision poles and a progressive surface between said poles, said progressive surface having regions adjacent to said poles and a middle region between said poles and having a power law which provides power gradients in said regions adjacent to the poles which are relatively steep as contrasted with relatively gradual power gradients in said middle region thereof between said poles.
A lens having near vision and far vision poles and a progressive surface between said poles, said progressive surface having regions adjacent to said poles and a middle region between said poles and having a power law which provides a power gradient in the region adjacent to one of the poles than in said middle region of said progressive surface.
Dependencies are inferred from the claim text.