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US 8,939,578 B2Granted
Progressive reading and intermediate distance lens defined by employment of a zernike expansion
AssigneeVisionware LLC
InventorJohn D. Lytle
Life of this patent
Estimating the term…
Abstract
There is provided a lens that includes a corridor having a width greater than or equal to about 6 millimeters. The lens has astigmatism less than or equal to about 0.5 diopter within the corridor. There is also provided an item of eyewear that includes such a lens, and a method for representing a surface of an ophthalmic lens.
Claims16
An item of eyewear, comprising:
- a lens holder;
- and
- a pair of progressive addition lenses situated in said lens holder to satisfy a span of interpupillary distances of at least 6 millimeters,
- wherein said pair of progressive addition lenses includes a lens having a surface that has a continuous monotonic change of power through (a) a first zone for reading at a distance of about 35 centimeters to about 45 centimeters from said lens through (b) a second zone for viewing at near and intermediate distances from about 45 centimeters to about four meters from said lens, and
- wherein said second zone includes a corridor having a length of greater than or equal to about 16 millimeters and a width of greater than or equal to about 6 millimeters along said length.
2 more elements
A method comprising:
- representing a surface for each of a pair of ophthalmic lenses by way of a Zernike expansion;
- and situating said pair of ophthalmic lenses in a lens holder to satisfy a span of interpupillary distances of at least 6 millimeters wherein said pair of ophthalmic lenses includes a lens having a surface that has a continuous monotonic change of power through (a) a first zone for reading at a distance of about 35 centimeters to about 45 centimeters from said lens through (b) a second zone for viewing at near and intermediate distances from about 45 centimeters to about four meters from said lens, and wherein said second zone includes a corridor having a length of greater than or equal to about 16 millimeters and a width of greater than or equal to about 6 millimeters along said length.
A method comprising:
- designing an ophthalmic lens,
- wherein said designing employs, as design parameters,
- (a) a predetermined boundary shape of said ophthalmic lens for ultimate use, and
- (b) a predetermined boundary size of said ophthalmic lens for ultimate use,
- wherein said ophthalmic lens has a surface having a continuous monotonic change of power through (a) a first zone for reading at a distance of about 35 centimeters to about 45 centimeters from said ophthalmic lens through (b) a second zone for viewing at near and intermediate distances from about 45 centimeters to about four meters from said ophthalmic lens, and
- wherein said second zone includes a corridor having a length of greater than or equal to about 16 millimeters and a width of greater than or equal to about 6 millimeters along said length.
3 more elements
Dependencies are inferred from the claim text.