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Title:
MULTI-FOCAL OPHTHALMOLOGIC LENS WITH SPHERICAL ABERRATION CHANGED BY ADDITION AND REFRACTION ABNORMALITY
Document Type and Number:
Japanese Patent JPH11242193
Kind Code:
A
Abstract:

To provide a progressive multi-focal ophthalmologic lens where the relation between progression of the spherical aberration of eyeballs due to aging and a refraction abnormality is taken into consideration.

In this multi-focal ophthalmologic lens 11, the visual profile (unit: diopter) of the lens as a function of height (k) (unit: mm) on an axis A of the lens and the addition (Add) corresponding to the degree of presbyopia of a user is defined by P(h)=f(PVL, Add, h) +C(Add, PVL)h2+B(Add,PVL) where PVL, (f), C(Add, PVL), and B(Add, PVL) are the vision (unit: diopter) required for far sight, a function of evolution between near vision and far vision, a spherical aberration correction coefficient determined by the addition and the far vision, and a vision correction coefficient determined by the spherical aberration coefficient. respectively.


Inventors:
BAUDE DOMINIQUE
CHATEAU NICOLAS
Application Number:
JP35735098A
Publication Date:
September 07, 1999
Filing Date:
December 16, 1998
Export Citation:
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Assignee:
ESSILOR INT
International Classes:
A61F2/16; G02C7/04; G02C7/06; (IPC1-7): G02C7/04; A61F2/16; G02C7/06
Attorney, Agent or Firm:
Minoru Nakamura (6 outside)



 
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