Method and apparatus for forming a lens

Patent metadata

Field	Value
Publication number	US-11285681-B2
Application number	US-201715720711-A
Country	US
Kind code	B2
Filing date	Sep 29, 2017
Priority date	Sep 30, 2016
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

Exemplary embodiments of the present disclosure provide a method and apparatus for forming an ophthalmic lens. An exemplary method includes providing a plurality of posterior tools each having a posterior optic defining surface and a plurality of anterior tools each having an anterior optic defining surface, wherein each one of the plurality of posterior tools has a different central posterior optic defining surface including a unique conic section. The method further includes selecting one of the plurality of posterior tools and one of the plurality of anterior tools based on a criteria, and forming a posterior mold by the selected one of the plurality of posterior tools and an anterior mold by the selected one of the plurality of anterior tools, the posterior mold and the anterior mold operable to form an ophthalmic lens having the criteria.

First claim

The invention claimed is:

1. A method of forming an ophthalmic lens, the method comprising:
(a) providing a plurality of posterior tools each having a posterior optic defining surface and a plurality of anterior tools each having an anterior optic defining surface, wherein the plurality of anterior tools and the plurality of posterior tools form a tooling set, wherein each one of the plurality of anterior tools has a different central anterior optic defining surface having an anterior conic constant, wherein each one of the plurality of posterior tools has a different central posterior optic defining surface including a unique conic constant which varies for each posterior tool, and wherein the central posterior optic defining surface of each posterior tool varies in increments which are subdivisions of 0.25 diopters;
(b) selecting one of the plurality of posterior tools and one of the plurality of anterior tools based on a criteria, wherein the criteria includes a spherical power correction; and
(c) forming a posterior mold by the selected one of the plurality of posterior tools and forming an anterior mold to be paired with the posterior mold by the selected one of the plurality of anterior tools, the posterior mold and the anterior mold operable to form an ophthalmic lens having a unique spherical power correction, wherein each ophthalmic lens includes a spherical aberration value within a predetermined range, and wherein the predetermined range is maintained by the unique conic constant which varies for each posterior tool used to form each posterior mold.

2. The method according to claim 1 , wherein the spherical aberration value is within a range of about 0.1 to about 0.2 μm.

3. The method according to claim 2 , wherein the spherical aberration value is about 0.180 μm.

4. The method according to claim 1 , wherein the criteria further includes a cylindrical power correction.

5. The method according to claim 1 , wherein the anterior optic defining surface of each anterior tool vary in 1.0 diopter increments and the posterior optic defining surface of each posterior tool vary in 0.0625 diopter increments.

6. A method of forming an ophthalmic lens, the method comprising:
(a) providing a plurality of posterior tools each having a posterior optic defining surface and a plurality of anterior tools having an anterior optic defining surface, wherein the plurality of anterior tools and the plurality of posterior tools form a tooling set, wherein each one of the plurality of anterior tools has a different central anterior optic defining surface having an anterior conic constant, wherein each one of the plurality of anterior tools has a different central anterior optic defining surface including a unique conic constant which varies for each posterior tool, and wherein the central posterior optic defining surface of each posterior tool varies in increments which are subdivisions of 0.25 diopters;
(b) selecting one of the plurality of posterior tools and one of the plurality of anterior tools based on a criteria, wherein the criteria includes a spherical power correction; and
(c) forming a posterior mold by the selected one of the plurality of posterior tools and an anterior mold by the selected one of the plurality of anterior tools, the posterior mold and the anterior mold operable to form an ophthalmic lens having a unique spherical power correction, wherein each ophthalmic lens includes a spherical aberration value within a predetermined range, and wherein the predetermined range is maintained by the unique conic constant which varies for each posterior tool used to form each posterior mold.

7. The method according to claim 6 , wherein the anterior optic defining surface of each anterior tool vary in 1.0 diopter increments and the posterior optic defining surface of each posterior tool vary in 0.0625 diopter increments.

Assignees

• Bausch & Lomb

Inventors

• Fahy Kevin J

Classifications

• B29D11/00038 Primary

  Production of contact lenses · CPC title

• B29D11/00509

  to make toric lenses · CPC title

• B29D11/00134

  Curing of the contact lens material · CPC title

• B29D11/00019

  with non-spherical faces, e.g. toric faces · CPC title

• B29D11/0048

  Moulds for lenses (moulds for plastic articles in general B29C33/00) · CPC title