Title:
PROGRESSIVE REFRACTIVE POWER LENS
Document Type and Number:
WIPO Patent Application WO/2007/010806
Kind Code:
A1
Abstract:
A progressive refractive power lens easily capable of measuring the power of
the lens by an optician store or a user despite satisfactory improvement in optical
performance while the user wears. The lens comprises, along a main fixation line
(MM') that divides a lens refractive plane into a nose side area and an ear
side area, a distant unit (F) comparatively suitable for distant viewing, a reading
unit (N) comparatively suitable for near viewing, and a progressive unit (P)
for continuously connecting the plane refractive power of the distant unit and
the plane refractive power of the reading unit, when the lens is worn. An average
value of absolute values of differences between a surface astigmatic difference
component generated by the prescribed aspherical surface formed to correct
optical performance at a lens-transmitting light beam and a surface astigmatic
difference component generated by a spherical or toric surface required for
prescribed power correction is up to a specified value over a specified area in
the vicinity of and including a measurement reference point (OF).
Inventors:
YANARI MITSUHIRO (JP)
Application Number:
PCT/JP2006/313922
Publication Date:
January 25, 2007
Filing Date:
July 06, 2006
Export Citation:
Assignee:
NIKON ESSILOR CO LTD (JP)
YANARI MITSUHIRO (JP)
YANARI MITSUHIRO (JP)
International Classes:
G02C7/06
Foreign References:
| JP2000066148A | 2000-03-03 | |||
| JP2004341086A | 2004-12-02 |
Attorney, Agent or Firm:
INOUE, Yoshio (1-4 Nihonbashi 3-chome, Chuo-k, Tokyo 27, JP)
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