Progressive-power lens and progressive-power lens design method
First Claim
Patent Images
1. A progressive-power lens comprising:
- an eyeball-side surface includinga distance portion and a near portion having different values of dioptric power, andan intermediate portion that connects the distance portion and the near portion to each other; and
an object-side surface includinga spherical first region having a constant first curvature and extending along a principal meridian,a spherical second region having a second curvature equal to the first curvature and facing the distance portion, anda third region located outside the first region and below the second region and having a third curvature smaller than the first curvature, wherein the third region has an aspherical shape.
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Abstract
A progressive-power lens having an eyeball-side surface including a distance portion and a near portion having different values of dioptric power and an intermediate portion that connects the distance portion and the near portion to each other, and an object-side surface including a spherical first region having a first curvature and extending along a principal meridian, a spherical second region having a second curvature equal to the first curvature and facing the distance portion, and a third region located outside the first region and below the second region and having a third curvature smaller than the first curvature.
13 Citations
7 Claims
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1. A progressive-power lens comprising:
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an eyeball-side surface including a distance portion and a near portion having different values of dioptric power, and an intermediate portion that connects the distance portion and the near portion to each other; and an object-side surface including a spherical first region having a constant first curvature and extending along a principal meridian, a spherical second region having a second curvature equal to the first curvature and facing the distance portion, and a third region located outside the first region and below the second region and having a third curvature smaller than the first curvature, wherein the third region has an aspherical shape. - View Dependent Claims (2, 3, 4)
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5. A progressive-power lens design method comprising:
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designing an eyeball-side surface based on a spectacle specifications, the eyeball-side surface including a distance portion and a near portion having different values of dioptric power and an intermediate portion that connects the distance portion and the near portion to each other; and designing an object-side surface including a spherical first region having a constant first curvature and extending along a principal meridian, a spherical second region having a second curvature equal to the first curvature and facing the distance portion, and a third region located outside the first region and below the second region and having a third curvature smaller than the first curvature, wherein the third region has an aspherical shape. - View Dependent Claims (6, 7)
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Specification