# US 12,758,094 B2 · Method for quantifying ocular dominance of a subject and apparatus for implementing a method for quantifying ocular dominance of a subject

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- Number: US 12,758,094 B2
- Document ID: US12758094B2
- Status: Granted
- Kind: B2
- Application number: 17/759,020
- Filed: 2021-01-19
- Published: 2023-02-02
- Granted: 2026-10-13
- Earliest claimed: 2020-01-20
- Assignees: Essilor International
- Applicants: Essilor International
- Inventors: Martha Hernandez-Castaneda; Paul Vernerey; Gildas Marin
- Web page: https://patentgrep.com/patent/US12758094B2

## CPC

- A61B 3/032: Devices for presenting test symbols or characters, e.g. test chart projectors (A61B3/036 takes precedence)
- A61B 3/08: for testing binocular or stereoscopic vision, e.g. strabismus
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

An apparatus for quantifying ocular dominance of a subject, including at least one display for providing a first image representing a first target to a first eye of the subject, and for providing a second image representing a second target to a second eye of the subject, and a control unit to control the at least one display.

## Claims

### Claim 1

An apparatus for quantifying ocular dominance of a subject comprising:
at least one display to display a first image representing a first target to a first eye of the subject, and to display a second image representing a second target to a second eye of the subject; and
processing circuitry configured to control the at least one display, wherein
the first image and the second image are such that the first target on the first image has an identical position, an identical orientation, an identical size and an identical shape to the second target on the second image;
the first target comprises n points and the second target comprises n points where n≥3, the n points of the first target having a same shape and a same size as the n points of the second target, and the n points of the first target having a different phase shift from the n points of the second target;
each point PLi of the first target matches with a point PRi of the second target where point PLi has a same position in the first image as point PRi in the second image where 1≤i≤n;
to each point of the first target and to each point of the second target corresponds respectively a feature value VLi for the first target and a feature value VRi for the second target;
feature values of the at least three points of the first target, which have the same shape and the same size as the points of the second target and which have the different phase shift from the points of the second target, differ such that an intensity of the feature values, of the at least three points of the first target, gradually increases between each of the at least three points of the first target, and such that an intensity of the feature values, of the at least three points of the second target, gradually decreases between each of the at least three points of the second target; and
for two points of the first target having feature values VLi and VLj, respectively, and two points of the second target having feature values VRi and VRj, respectively, VLi+VRi=VLj+VRj for any i and j where 1≤j≤n.

### Claim 2 (depends on 1)

The apparatus according to claim 1, further comprising:
a first optical unit and a second optical unit respectively in front of the first eye and in front of the second eye of the subject, and
a power modulator to change an optical power of the optical unit in front of each eye, the power modulator being controlled by the processing circuitry.

### Claim 3 (depends on 1)

The apparatus according to claim 1, wherein feature values of a target are luminosity or color, and when the feature values are colors, VLi+VRi is a same color as VLj+VRj.

### Claim 4 (depends on 1)

The apparatus according to claim 1, wherein the shape of the targets is:
an element grid comprising at least three elements, the at least three elements having the same shape and the same size,
an element line comprising at least three elements, the at least three elements having the same shape and the same size,
an element column comprising the at least three elements, the at least three elements having the same shape and the same size,
at least two fringes,
letter(s),
optotype(s), or
figure(s).

### Claim 5 (depends on 1)

The apparatus according to claim 1, wherein the processing circuitry is further configured to execute an adaptive algorithm
to accept a report describing how the subject sees when presented the first image and the second image,
to calculate adjustments of the feature values of the first and/or second target on the first image and the second image to be presented in a next iteration of the first image and the second image according to the report, and
to display the next iteration of the first image and the second image to the subject.

### Claim 6 (depends on 2)

The apparatus according to claim 2, wherein the processing circuitry is further configured to execute an adaptive algorithm
to accept a report describing how the subject sees when presented the first image and the second image, and
to calculate adjustments of the optical power of the optical units in a next iteration of the first image and of the second image according to the report.

### Claim 7 (depends on 1)

A refractometer comprising the apparatus for quantifying ocular dominance of a subject according to claim 1.

### Claim 8 (depends on 1)

The apparatus according to claim 1, wherein
feature values of a target are luminosity,
the intensity of the feature values gradually increases from dim light to bright light, and
the intensity of the feature values gradually decreases from bright light to dim light.

### Claim 9

A device comprising:
processing circuitry configured to control display of a set of images for quantifying ocular dominance of a subject, the set of images including a first image representing a first target and a second image representing a second target, wherein:
the first image and the second image are such that the first target on the first image has an identical position, an identical orientation, an identical size and an identical shape to the second target on the second image;
the first target comprises n points and the second target comprises n points where n≥3, the n points of the first target having a same shape and a same size as the n points of the second target, and the n points of the first target having a different phase shift from the n points of the second target;
each point PLi of the first target matches with a point PRi of the second target where point PLi has a same position in the first image as point PRi in the second image where 1≤i≤n;
to each point of the first target and to each point of the second target corresponds respectively a feature value VLi for the first target and a feature value VRi for the second target;
feature values of the at least three points of the first target, which have the same shape and the same size as the points of the second target and which have the different phase shift from the points of the second target, differ such that an intensity of the feature values, of the at least three points of the first target, gradually increases between each of the at least three points of the first target, and such that an intensity of the feature values, of the at least three points of the second target. gradually decreases between each of the at least three points of the second target; and
for two points of the first target having feature values VLi and VLj, respectively, and two points of the second target having feature values VRi and VRj, respectively,
VLi+VRi=VLj+VRj for any i and j where 1≤j≤n.

### Claim 10

A method for quantifying ocular dominance of a subject comprising:
displaying a first image to a first eye of the subject, the first image representing a first target;
displaying a second image to a second eye of the subject, the second image representing a second target;
checking that the subject sees a fused image from the first image and the second image, the fused image comprising a fused target with feature values;
generating a first report describing the features values of the fused image; and
determining which eye is a dominant eye of the subject based on the first report, wherein
the first image and the second image are such that the first target on the first image has an identical position, an identical orientation, an identical size and an identical shape to the second target on the second image;
the first target comprises n points and the second target comprises n points where n≥3, the n points of the first target having a same shape and a same size as the n points of the second target, and the n points of the first target having a different phase shift from the n points of the second target;
each point PLi of the first target matches with a point PRi on the second target where point PLi has a same position in the first image as point PRi in the second image, where 1≤i≤n;
to each point of the first target and to each point of the second target corresponds respectively a feature value VLi for the first target and a feature value VRi for the second target;
feature values of the at least three points of the first target, which have the same shape and the same size as the points of the second target and which have the different phase shift from the points of the second target, differ such that an intensity of the feature values, of the at least three points of the first target, gradually increases between each of the at least three points of the first target, and such that an intensity of the feature values, of the at least three points of the second target, gradually decreases between each of the at least three points of the second target; and
for two points of the first target having feature values VLi and VLj, respectively, and two points of the second target having feature values VRi and VRj, respectively, VLi+VRi=VLj+VRj for any i and j where 1≤j≤n.

### Claim 11 (depends on 10)

The method according to claim 10, further comprising after determining which eye is the dominant eye of the subject:
calculating adjustments to the feature values of the first and/or second target on the first image and the second image to be presented in a next iteration of the first image and the second image according to the report;
displaying the next iteration of the first image and the second image with the adjusted feature values;
generating a second report describing how the subject sees the features values of the fused target from the next iteration of the first image and of the second image;
repeating the calculating the adjustments, the displaying the next iteration, and the generating the second report until the subject indicates that the feature values of the fused target of the fused image are constant at each point of the fused target of the fused image; and
quantifying ocular dominance of the subject based on the reports of the subject.

### Claim 12 (depends on 10)

The method according to claim 10,
wherein the shape of the targets is a set of at least three elements, said at least three elements having the same shape and the same size,
wherein the feature values of the target are luminosity, and
wherein the first report describes a location of a brightest and/or darkest element of the fused target of the fused image.

### Claim 13 (depends on 10)

The method according to claim 10,
wherein the target is a set of at least three elements, said at least three elements having the same shape and the same size,
wherein the feature values of the target are colors of the target,
VLi+VRi=VLj+VRj
meaning that VLi corresponds to a first color and VLj corresponds to a second color which is a complementary color of the first color and VLi+VRi is a same color as VLj+VRj, and
wherein the reports describe a location of the colors on the fused target of the fused image.

### Claim 14 (depends on 10)

The method according to claim 10, wherein the fused image is a 3-D stereoscopic image.

### Claim 15

A method for adjusting a binocular balance of a subject comprising:
displaying a first image to a first eye of the subject, the first image representing a first target;
displaying a second image to a second eye of the subject, the second image representing a second target;
checking that the subject sees a fused image from the first image and the second image, the fused image comprising a fused target with feature values;
generating a report describing the features values of the fused image;
determining which eye is a dominant eye of the subject based on the report; and
providing a correction to the dominant eye of the subject by adjusting a power lens in front of the first eye and/or the second eye until the feature values of the fused image are constant for the subject, wherein
the first image and the second image are such that the first target on the first image has an identical position, an identical orientation, an identical size and an identical shape to the second target on the second image,
the first target comprises n points and the second target comprises n points where n≥3, the n points of the first target having a same shape and a same size as the n points of the second target, and the n points of the first target having a different phase shift from the n points of the second target;
each point PLi of the first target matches with a point PRi on the second target where point PLi has a same position in the first image as point PRi in the second image where 1≤i≤n;
to each point of the first target and to each point of the second target corresponds respectively a feature value VLi for the first target and a feature value VRi for the second target;
feature values of the at least three points of the first target, which have the same shape and the same size as the points of the second target and which have the different phase shift from the points of the second target, differ such that an intensity of the feature values, of the at least three points of the first target, gradually increases between each of the at least three points of the first target, and such that an intensity of the feature values, of the at least three points of the second target, gradually decreases between each of the at least three points of the second target; and
for two points of the first target having feature values VLi and VLj, respectively, and two points of the second target having feature values VRi and VRj, respectively, VLi+VRi=VLj+VRj for any i and j where 1≤j≤n.

### Claim 16 (depends on 15)

The method for adjusting a binocular balance of a subject according to claim 15, further comprising:
measuring a refraction of each eye of the subject; and
providing a correction based on the measured refraction by adjusting a power lens in front of the first eye and/or the second eye.