Eyeglass lens and eyeglass lens manufacturing method
AssigneeHoya Lens Thailand Ltd.
InventorShohei MATSUOKA
Life of this patent
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Abstract
A spectacle lens to which a base in prism deflecting light toward a nose of a user is added, wherein the spectacle lens has a reverse prism slope that has a sign opposite to a sign of an addition prism slope on a progressive zone at least in a distance side region of the addition prism curve expressed as a function of vertical coordinates on the spectacle lens, and an absolute value of the reverse prism slope is larger than 0.014 times the absolute value of the addition prism slope on the progressive zone.
Claims16
A spectacle lens to which a base in prism deflecting light toward a nose of a user is added,
- wherein the spectacle lens has a reverse prism slope that has a sign opposite to a sign of an addition prism slope on a progressive zone at least in a distance side region of the addition prism curve expressed as a function of vertical coordinates on the spectacle lens, and
- an absolute value of the reverse prism slope is larger than 0.014 times the absolute value of the addition prism slope on the progressive zone.
A manufacturing method of a spectacle lens to which a base in prism deflecting light toward a nose of a user is added, comprising:
- a prism design step to design so that the spectacle lens has a reverse prism slope that has a sign opposite to a sign of an addition prism slope on a progressive zone at least in a distance side region of the addition prism curve expressed as a function of vertical coordinates on the spectacle lens,
- wherein in the prism design step, an absolute value of the reverse prism slope is designed to be larger than 0.014 times the absolute value of the addition prism slope on the progressive zone.
Dependencies are inferred from the claim text.