Spectacle lenses and methods for producing the same
AssigneeHoya Lens Thailand Ltd.
InventorsHiroshi Asami, Yasunori Izawa
Life of this patent
Estimating the term…
Abstract
A lens, system for designing, computer program for designing and a method for designing, with a computer, a progressive addition lens including a distance vision region, a near vision region, and an intermediate vision region, wherein a power gradually changes between the distance vision region and the near vision region, and wherein the progressive addition lens is based on prescription data, the method including: determining a transmission astigmatic performance parameter corresponding to a sum of a prescribed astigmatism included in the prescription data and of a predetermined amount of extra astigmatism; determining lens surface data corresponding to the determined transmission performance parameter.
Claims15
A method for designing, by means of a computer, a progressive addition lens comprising a distance vision region, a near vision region, and an intermediate vision region, wherein a power gradually changes between the distance vision region and the near vision region, and wherein the progressive addition lens is based on prescription data, the method comprising:
- determining a transmission astigmatic performance parameter corresponding to a prescribed astigmatism included in the prescription data added with an extra astigmatism, the extra astigmatism only being added to the near vision region and the intermediate vision region, out of the distance vision region, the near vision region, and the intermediate vision region;
- determining lens surface data corresponding to the determined transmission astigmatic performance parameter.
A progressive addition lens comprising a distance vision region, a near vision region, and an intermediate vision region,
- wherein a power gradually changes between the distance vision region and the near vision region, and
- wherein the lens has a surface exhibiting transmission astigmatic performance of prescription data added with an extra astigmatism, the extra astigmatism only being added to the near vision region and the intermediate vision region, out of the distance vision region, the near vision region, and the intermediate vision region.
Dependencies are inferred from the claim text.