Spectacle lens and manufacturing method therefor

• US 20040032565A1
• Filed: 08/08/2003
• Published: 02/19/2004
• Est. Priority Date: 02/12/1999
• Status: Active Grant

• Current Assignee: Hoya Corporation
• Original Assignee: Hoya Corporation
• Inventors: Hatanaka, Takashi, Yamakaji, Tetsuma
• Granted Patent: US 6,871,955 B2
• Time in Patent Office: Days
• US Class Current: 351/177
• CPC Class Codes: G02C 13/003 Measuring during assembly or fitting of spectacles
• CPC Class Codes: G02C 7/027 considering wearer's parameters
• CPC Class Codes: G02C 7/028 Special mathematical design techniques
• CPC Class Codes: G02C 7/061 Spectacle lenses with progressively varying focal power
• CPC Class Codes: G05B 2219/36384 Load machining program and workpiece delivery program together
• CPC Class Codes: G05B 2219/45175 Glasses, spectacles

Abstract

A spectacle lens is designed by using a value determined by either measuring or specifying for an individual spectacles wearer the value of the distance VR from a reference point on the back surface of a spectacle lens to the center of rotation of the eye, which adds together the value of the distance VC from a reference point of the back surface of a spectacle lens to the vertex of the cornea of the eye of the spectacles wearer at spectacle lenses wearing time, which is one of the required data in spectacle lens design, and the distance CR from the above-mentioned vertex of the cornea to the center of rotation of the eye, and manufacturing a spectacle lens based on this design specification.

Claims

1. A spectacle lens, wherein there is determined, by either measurement or specification for an individual spectacles wearer, a value of the distance VR from a reference point on the back surface of a spectacle lens to the center of rotation of the eye, which is given by adding a value of the distance VC from a reference point on the back surface of a spectacle lens to the vertex of the cornea of the eye of a spectacles wearer when spectacles are being worn, which is one of the required data in spectacle lens design, to the distance CR from said cornea vertex to the center of rotation of the eye, and the spectacle lens is designed using the value VR thereof, and is manufactured based on the design specifications.