Title:
NON-PROGRESSIVE CORRIDOR BI-FOCAL LENS WITH SUBSTANTIALLY TANGENT BOUNDARY OF NEAR AND DISTAL VISUAL FIELDS
Document Type and Number:
Japanese Patent JP2019164392
Kind Code:
A
Abstract:
To provide a lens that avoids both bifocal jump and astigmatism associated with standard progressive lens designs.SOLUTION: The present invention relates to a bifocal, non-progressive ophthalmic lens comprising a rotationally symmetric convex surface, and a concave surface opposite the convex surface, the concave surface including a first visual field having first optical power for distance vision and a second visual field having second optical power for near vision. The first and second visual fields are smoothly coupled in a tangential manner without a progressive corridor, and smoothly blend with the remainder of the concave surface. Respective radii of the first and second visual fields form a straight line lying between the first and second visual fields and extending on a center line of a contact surface also included in the concave surface of the lens.SELECTED DRAWING: Figure 5
Inventors:
MICHAEL WALACH
ANDRZEJ FIJALKOWSKI
ANDRZEJ FIJALKOWSKI
Application Number:
JP2019127345A
Publication Date:
September 26, 2019
Filing Date:
July 09, 2019
Export Citation:
Assignee:
MICHAEL WALACH
ANDRZEJ FIJALKOWSKI
ANDRZEJ FIJALKOWSKI
International Classes:
G02C7/06
Domestic Patent References:
| JP2016537664A | 2016-12-01 | |||
| JPH01152416A | 1989-06-14 | |||
| JPS5749914A | 1982-03-24 | |||
| JPS54104854A | 1979-08-17 | |||
| JP2012194388A | 2012-10-11 |
Foreign References:
| US20100149485A1 | 2010-06-17 |
Attorney, Agent or Firm:
▲吉▼川 俊雄
Kana Ichikawa
Kana Ichikawa