V-Shape Progressive Lens Design
First Claim
Patent Images
1. A progressive lens comprising:
- a progressive add zone; and
a corridor width including a horizontal length between two points at the same vertical position where the cylinder astigmatism is approximately 0.75 D;
wherein, a cylinder map of the lens includes a plurality of vertically separated corridor widths forming a substantially v-shaped corridor between the cylinder astigmatism of approximately 0.75 D.
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Abstract
Progressive lens designs are provided with various features relative to the corridor width, corridor length, and relative positioning of areas of maximum gradient power progression and maximum gradient, that differ from conventional progressive lens designs. Progressive lenses according to the invention may include a “V-shaped” cylinder map, a relatively low position of maximum gradient of power progression, and/or a large vertical separation between vertical position of maximal cylinder and vertical position of maximum gradient of power progression.
5 Citations
9 Claims
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1. A progressive lens comprising:
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a progressive add zone; and a corridor width including a horizontal length between two points at the same vertical position where the cylinder astigmatism is approximately 0.75 D; wherein, a cylinder map of the lens includes a plurality of vertically separated corridor widths forming a substantially v-shaped corridor between the cylinder astigmatism of approximately 0.75 D. - View Dependent Claims (2, 3)
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4. A progressive lens comprising:
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a progressive add zone; a corridor length including a length between a fitting point and a vertical position of at least one of a near measuring point and a point where full addition is reached; wherein, an addition gradient map of the lens includes a maximum gradient of power progression in a lower half of a corridor length. - View Dependent Claims (5, 6)
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7. A progressive lens comprising:
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a progressive add zone; a corridor length including a length between a fitting point and a vertical position of at least one of a near measuring point and a point where full addition is reached; wherein, a comparison between a cylinder map of the lens and an addition gradient map of the lens indicates a vertical separation between a vertical position of maximal cylinder and a vertical position of maximum gradient of power progression, the vertical separation being greater than 20% of the corridor length. - View Dependent Claims (8, 9)
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Specification