Customized progressive addition lenses

• US 6,390,623 B1
• Filed: 03/29/2000
• Issued: 05/21/2002
• Est. Priority Date: 03/29/2000
• Status: Expired due to Fees

• Current Assignee: Essilor International SA
• Original Assignee: Johnson & Johnson Vision Care Incorporated (Johnson & Johnson)
• Inventors: Kokonaski, William, Gupta, Amitava, Menezes, Edgar, Katzman, Daniel
• Primary Examiner(s): SCHWARTZ, JORDAN MARC
• Application Number:
  US09/535,791
• Time in Patent Office: 783 Days
• Field of Search: 351/169, 351/177, 351/168, 351/170-172
• US Class Current: 351/169
• CPC Class Codes: G02C 7/061 Spectacle lenses with progressively varying focal power
• CPC Class Codes: G02C 7/063 Shape of the progressive surface

Abstract

The invention provides progressive addition lenses designed for uses in which a large region of intermediate refractive power is desirable. The enlarged intermediate region is provided without partial or complete elimination of the distance vision zone.

Claims

1. A progressive addition lens comprising at least one surface comprising a far vision zone, a near vision zone, and a channel having a length of about 19 mm or less, wherein the width of the far vision zone is about equal to or greater than the width of the channel and the width of the channel is about equal to or greater than the width of the near vision zone and wherein the lens has a maximum, unwanted astigmatism of less than about 80 percent of the dioptric add power.

2. The lens of claim 1, wherein the lens is a spectacle lens.

3. The lens of claim 1, wherein the unwanted astigmatism is about 40 to about 80 percent.

4. The lens of claim 1, wherein the width of the far vision zone is about equal to the width of the channel and the width of the channel is about equal to or greater than the width of the near vision zone.

5. The lens of claim 1, wherein the width of the far vision zone is about equal to the width of the channel and the width of the channel is about equal to the width of the near vision zone.

6. The lens of claim 1, wherein the width of the far vision zone is greater than the width of the channel and the width of the channel is about equal to or greater than the width of the near vision zone.

7. The lens of claim 1, wherein the width of the far vision zone is greater than the width of the channel and the width of the channel is greater than the width of the near vision zone.

8. A method for designing a lens, comprising the step of designing a lens having at least one progressive surface, wherein the entire progressive surface is optimized as a whole, a channel power gradient of about 0.12 diopters/mm or less is used, and the channel length is about 19 mm or less, wherein the lens is a progressive addition lens comprising at least one surface comprising a far vision zone, a near vision zone, and a channel, wherein the width of the far vision zone is about equal to or greater than the width of the channel and the width of the channel is about equal to or greater than the width of the near vision zone and wherein the lens has a maximum, unwanted astigmatism of less than about 80 percent of the dioptric add power.