Method for optimizing a Fresnel optical lens

Patent metadata

Field	Value
Publication number	US-10409086-B2
Application number	US-201314652061-A
Country	US
Kind code	B2
Filing date	Dec 10, 2013
Priority date	Dec 12, 2012
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

Method means for optimizing an optical lens adapted to a wearer, using an initial optical system providing stage (S 1 ), during which an initial optical system is provided. The initial optical system has at least a light source ( 10 ), a light receiver ( 12 ) and an initial optical lens (L 0 ) placed between the source ( 10 ) and the receiver ( 12 ), the initial optical lens a Fresnel zone, a working optical lens defining stage (S 2 ), for evaluating a working optical lens is defined to be equal to the initial optical lens (L 0 ), an evaluation stage (S 3 ), during which a cost function related to the number of light rays received by the light receiver ( 12 ) that have passed through the annular step of the working optical lens, a modifying stage (S 4 ), for modifying the annular step of the working optical lens, wherein the evaluation and modifying steps are repeated to minimize the cost function.

First claim

The invention claimed is:

1. A method implemented by a computer for optimizing an optical lens adapted to a wearer, the method comprising:
obtaining information from an initial optical system comprising at least a light source, a light receiver and an initial optical lens placed between the light source and the light receiver, the initial optical lens comprising at least a Fresnel zone, the Fresnel zone comprising at least two discontinuous optically functional annular sections joined by at least one annular step;
defining a working optical lens to be equal to the initial optical lens;
performing an evaluation of the obtained information using a cost function related to the number of light rays received by the light receiver from the light source that have passed through the annular step of the working optical lens;
modifying the annular step of the working optical lens based on the evaluation,
wherein the performing the evaluation and modifying the annular step are repeated to minimize the cost function, thus reducing the number of light rays received by the light receiver from the light source that have passed through the annular step of the working optical lens, and
wherein the light receiver is at the locus of the wearer's pupil points when the wearer's eye rotates in all directions; and
outputting optimized optical lens information of a final working optical lens once the repetition of the performing the evaluation and modifying the annular step is complete,

wherein
the cost function Fm is given by

Fm
=

∑

Z
⁢

⁢
1

⁢

[

(

P
i

×

C

1
⁢

⁢
i

×

C

2
⁢
i

)

+

(

β
×

Nb

Z
⁢

⁢
1

)

]

×

[

∑

Z
⁢

⁢
2

⁢

(

P
i

×

C

1
⁢
i

×

C

2
⁢
i

)

]

/

(

Nb

Z
⁢

⁢
2

+
1

)

where
Z 1 and Z 2 are vision zones of the light receiver that receives the light ray,
Nb Z1 is the number of light rays that have arrived in zone 1 after having passed through an annular step of the working lens,
Nb Z2 is the number of light rays that have arrived in zone 2 after having passed through an annular step of the working lens,
Pi is the photonic weight of the light ray i, based on the number of crossed optical diopters,
C 1i is the weight of the light ray i based on a first criterion,
C 2i is the weight of the light ray i based on a second criterion, and
β is a weight factor.

2. The method according to claim 1 , wherein
during the modifying the annular step, an angle and/or a position and/or a cross-section shape of the annular step is modified.

3. The method according to claim 1 , wherein
the cost function is calculated by attributing different weights to each light ray received by the light receiver according to the zone of the light receiver that receives the light ray.

4. The method according to claim 1 , wherein
the light receiver is divided in three zones, the first zone corresponding to a central vision zone, the second zone corresponding to an intermediate vision zone and the third zone corresponding to a peripheral vision zone.

5. The method according to claim 1 , wherein
the cost function is calculated by attributing different weights to each light ray received by the light receiver according to the angle of incidence with which the light ray is received by the light receiver.

6. The method according to claim 1 , wherein
the cost function is calculated by attributing different weights to each light ray received by the receiver according to their photometric energy.

7. The method according to claim 1 , wherein
the Fresnel zone comprises a plurality of discontinuous optically functional annular sections joined by a plurality of annular steps and the method further comprises an evaluation zone providing stage during which an ev

Assignees

• Essilor Int

Inventors

• Colas Pauline
• Rego Carlos
• Amir Bruno
• Tessieres Melanie

Classifications

• G02C7/025 Primary

  considering parameters of the viewed object · CPC title

• G02C7/028

  Special mathematical design techniques · CPC title

• G02C2202/20

  Diffractive and Fresnel lenses or lens portions · CPC title

• G02C7/024 Primary

  Methods of designing ophthalmic lenses · CPC title