Prescription-dependent and individualization-dependent modification of the temporal peripheral nominal astigmatism and adaptation of the object distance function to changed object distances for near and far vision

Patent metadata

Field	Value
Publication number	US-9638935-B2
Application number	US-201514593050-A
Country	US
Kind code	B2
Filing date	Jan 9, 2015
Priority date	Oct 21, 2010
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

Method for optimization of a progressive spectacle lens, including: defining a starting nominal astigmatism distribution for the spectacle lens; determining a transformed nominal astigmatism distribution and optimizing the spectacle lens on the basis of the transformed nominal astigmatism distribution, wherein the determination of a transformed nominal astigmatism distribution comprises multiplication of the maximum temporal nominal astigmatism of the starting nominal astigmatism distribution by a factor k as a result of which a modified maximum temporal astigmatism is obtained, wherein k is a function of a prescription value, and/or at least of one parameter of the spectacle lens or of the arrangement thereof in front of the eyes, and transformation of the starting nominal astigmatism distribution on the basis of the modified maximum temporal astigmatism.

First claim

The invention claimed is:

1. A computer-implemented method for optimizing a progressive spectacle lens and forming the spectacle lens based on the method, comprising:
specifying a starting object distance function A 1G (y) that specifies a starting reciprocal object distance along the main line of sight as a function of the vertical coordinate y,
obtaining a target object distance from at least one predetermined point D on the main line of sight, said predetermined point having a vertical coordinate y D ;
modifying the starting object distance function based on the obtained target object distance to produce a modified object distance function A 1 (y), said modified object distance function specifying a modified reciprocal object distance along the main line of sight as a function of the vertical coordinate y;
optimizing the progressive spectacle lens, wherein in the optimization process of the spectacle lens the modified object distance function is taken into account, wherein:
modifying the starting object distance function A 1G (y) to produce a modified object distance function A 1 (y) comprises adding a correction function A 1corr (y) to the starting object distance function A 1G (y) in accordance with A 1 (y)=A 1G (y)+A 1corr (y),
wherein the correction function has at least one variable parameter, which is determined based on the obtained target object distance from the at least one predetermined point D such that the condition A 1 (y=y D )=A 1D is fulfilled, wherein A 1 (y=y D ) is the value of the modified object distance function in the least one predetermined point D and A 1D is the reciprocal value of the obtained target object distance for this point, and
forming the optimized progressive spectacle lens based on the method.

2. The method according to claim 1 , wherein the obtaining of a target object distance comprises obtaining a target object distance from a predetermined distance reference point on the main line of sight and a target object distance from a predetermined near reference point on the main line of sight.

3. The method according to claim 1 , wherein the starting object distance function is a double asymptote function

A

1
⁢
G

⁡

(
y
)

=

b
G

+

a
G

(

1
+

ⅇ

c
⁡

(

y
+
d

)

)

m

with the parameters a G , b G , c, d, m,
wherein:
the two asymptotes respectively have values b G and (b G +a G ),
a vertical position can be controlled with the variable parameter d, and the parameter d is in a range of −10<d<10,
the larger the value of the variable parameter c, the faster a transition from one of the two asymptotes to the other,
an absolute value of the parameter c is <1.5,
the parameter m, where m>0, describes the asymmetry of the double asymptote function,
for m=1, the double asymptote function has a point symmetry with a center y=−d, and the parameter m is in a range of 0.2<m<2, and
if a negative sign (c<0) is selected for the parameter c, it holds that:
a near portion asymptote A 1G (y→−∞)=A 1Gnear =b G , and
a distance portion asymptote A 1G (y→+∞)=A 1Gdistance =(b G +a G ).

4. The method according to claim 3 , wherein
the obtaining of a target object distance comprises obtaining a target object distance from a predetermined distance reference point on the main line of sight y D F and a target object distance from a predetermined near reference point on the main line of sight; and wherein:
the correction function is a double asymptote function

A

1
⁢
corr

⁡

(
y
)

=

b
corr

+

a
corr

(

1
+

ⅇ

c
corr

⁡

(

y
+

d
corr

)

)

m
corr

with the parameters a corr , b corr , c corr , d corr , m corr , wherein
the parameters c corr , d corr and m corr of the correction function are the same as the parameters c, d and m of the starting object distance function, respectively, such that c=c corr , d=d corr , m=m corr , and
the parameters b corr and a corr of the correction function are determined based on the obtained target object distance from the distance reference point and target object distance from the near reference point such that the following conditions are fulfilled:
A 1 ( y )= A 1G ( y )+ A 1corr ( y )
A 1 ( y D F )= A 1distance , and
A 1 ( y D N )= A 1near ,

wherein:
A 1distance is the reciprocal value of the target object distance from the distance reference point;
A 1near is the reciprocal value of the target object distance from the near reference point;
y D F is the vertical coordinate of the distance reference point; and

y D N is the vertical coordinate of the near reference point.

5. The method according to claim 2 ,
wherein the correction function is a linear function of the starting object distance function A corr (y)=c+mA 1G (y) with the parameters c and m,
wherein

Assignees

• Rodenstock Gmbh

Inventors

• Altheimer Helmut
• Kaster Robert
• Zimmermann Martin
• Becken Wolfgang
• Esser Gregor
• Uttenweiler Dietmar
• Welk Andrea

Classifications

• G02C7/065

  Properties on the principal line · CPC title

• G02C7/028 Primary

  Special mathematical design techniques · CPC title

• G02C7/063

  Shape of the progressive surface · CPC title

• G02C7/061

  Spectacle lenses with progressively varying focal power · CPC title