Method of determining optical parameters of an ophthalmic lens

Patent metadata

Field	Value
Publication number	US-9671618-B2
Application number	US-201314442945-A
Country	US
Kind code	B2
Filing date	Nov 13, 2013
Priority date	Nov 14, 2012
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

Method for determining the values of a set of n optical parameters (P 1 , P 2 , . . . , P n ) of an ophthalmic lens, n being an integer greater than or equal to 1, the method comprising: an nominal ophthalmic lens data providing step, an ophthalmic lens providing step, an optical surface measuring step, a surface errors determining step during which a set of m surface error parameters (α 1 , α 2 , . . . , α m ) is determined, m being an integer greater than or equal to 1, an optical parameter determining step during which each optical parameter of the set of optical parameters is determined by:
P i = P i , 0 + [ ∑ j = 1 m ⁢ ⁢ ( ∂ P i ∂ α j ) 0 × Δα j ] + A i
with P i the value of the ith optical parameter of the manufactured optical lens, P i,0 the value of the ith optical parameter of the nominal optical lens,

( ∂ P i ∂ α j ) 0
the value of the derivative of P i with respect to the jth surface error parameter α j on the nominal surface and Δα j the value of the jth surface error parameter, and A i a combination of terms of order greater or equal to 2 for each P i .

First claim

The invention claimed is:

1. A method for determining the values of a set of n optical parameters (P 1 , P 2 , . . . , P n ) of an ophthalmic lens to be manufactured, n being an integer greater than or equal to 1, the method comprising:
an ophthalmic lens data providing step during which data representing an ophthalmic lens is provided, including data corresponding to a surface of the ophthalmic lens;
an ophthalmic lens manufacturing step during which an ophthalmic lens is manufactured, the ophthalmic lens comprising at least two optical surfaces at least one of which is manufactured based on the data of the corresponding surface of the ophthalmic lens;
an optical surface measuring step during which the at least one manufactured surface of the ophthalmic lens is measured;
a surface errors determining step during which a set of m surface error parameters (α 1 , α 2 , . . . , α m ) is determined, m being an integer greater than or equal to 1, the surface error parameters representing the differences in position and/or shape of the measured optical surface and the corresponding surface of the ophthalmic lens; and
an optical parameter determining step during which each optical parameter of the set of optical parameters is determined by:

P
i

=

P

i
,
0

+

[

∑

j
=
1

m

⁢

⁢

(

∂

P
i

∂

α
j

)

0

×

Δα
j

]

+

A
i

with P i the value of the ith optical parameter of the manufactured optical lens, P i,0 the value of the ith optical parameter of the ophthalmic lens to be manufactured,

(

∂

P
i

∂

α
j

)

0

the value of the derivative of P i with respect to the jth surface error parameter α j on the surface and Δα j the value of the jth surface error parameter, and A i a combination of terms of order greater or equal to 2 for each P i .

2. The method according to claim 1 , wherein during the optical parameter determining step at least some of the optical parameters are determined by having:

A
i

=

1
2

⁡

[

∑

j
,

k
=
1

m

⁢

⁢

(

∂
2

⁢

P
i

∂

α
j

⁢

∂

α
k

)

0

×

Δα
j

×

Δα
k

]

with

⁢

(

∂
2

⁢

P
i

∂

α
j

⁢

∂

α
k

)

0

the value of the second derivative of P i with respect to the jth surface error parameter α j and the kth surface error parameter α k on the surface, Δα j the value of the jth surface error parameter and Δα k the value of the kth surface error parameter.

Assignees

• Essilor Int

Inventors

• Allione Pascal
• Chauveau Jean-Pierre
• Steigelman Daniel

Classifications

• G01M11/025

  by determining the shape of the object to be tested (measuring contours or curvatures by optical means G01B11/24) · CPC title

• G02C7/061

  Spectacle lenses with progressively varying focal power · CPC title

• G02C7/028 Primary

  Special mathematical design techniques · CPC title

• G01M11/02

  Testing optical properties · CPC title

• G02C7/027

  considering wearer's parameters · CPC title