Joint determination of accommodation and vergence

Patent metadata

Field	Value
Publication number	US-11445904-B2
Application number	US-202217590247-A
Country	US
Kind code	B2
Filing date	Feb 1, 2022
Priority date	Aug 23, 2019
Publication date	Sep 20, 2022
Grant date	Sep 20, 2022

Abstract

Methods and apparatuses for joint determination of accommodation and vergence of at least one eye of a user are disclosed. The joint determination includes determining an accommodation of the eye of the user and ascertaining values for checking myopia of the eye by presenting a sign at a first distance in front of the eye to stimulate the accommodation of the eye; capturing an eye movement; ascertaining a refraction of the eye with the accommodation of the eye at the first distance; and joint determination of accommodation and vergence of the eye by ascertaining a change in the refraction of the eye with the accommodation of the eye at the first distance in relation to the accommodation of the eye at a second distance; and ascertaining the vergence of the eye from the eye movement of the eye with the accommodation of the eye at the first distance.

First claim

The invention claimed is:

1. A method for jointly determining accommodation and vergence of at least one eye of a user, the method comprising the following steps:
a) presenting at least one symbol at at least one first distance in front of at least one eye of a user to stimulate an accommodation of the at least one eye;
b) capturing at least one eye movement of the at least one eye;
c) determining a refraction of the at least one eye with the accommodation of the at least one eye at the at least one first distance; and
d) jointly determining the accommodation and the vergence of the at least one eye by:
determining a change in the refraction of the at least one eye with the accommodation of the at least one eye at the at least one first distance in relation to the accommodation of the at least one eye at at least one second distance; and
determining the vergence of the at least one eye from the at least one eye movement of the at least one eye with the accommodation of the at least one eye at the at least one first distance,
wherein the refraction of the at least one eye is determined by capturing the at least one eye movement of the at least one eye based on the at least one symbol while a parameter of the at least one symbol is altered, wherein a point in time is determined at which a recognition threshold of the user for the at least one symbol emerges from the at least one eye movement, and wherein the refraction of the at least one eye is determined from the parameter for the at least one symbol defined at the point in time.

2. The method as claimed in claim 1 , wherein the joint determination of the accommodation and the vergence is implemented for both eyes of the user.

3. The method as claimed in claim 1 , wherein a newly determined value for the refraction of the at least one eye with the accommodation of the at least one eye at the at least one second distance is determined or wherein a known value for the refraction of the at least one eye with the accommodation of the at least one eye at the at least one second distance is used.

4. The method as claimed in claim 1 , wherein the refraction of the at least one eye is determined with a refraction measuring device, which is configured to capture the refraction of the at least one eye.

5. The method as claimed in claim 1 , wherein the eye movement of the at least one eye has an eye movement metric, wherein the eye movement metric is selected from the group consisting of a pursuit eye movement, an eye movement relating to microsaccades, and an optokinetic nystagmus.

6. The method as claimed in claim 1 , wherein the at least one symbol is presented by virtue of:
the at least one symbol being arranged at the first distance in front of the at least one eye;
the at least one symbol being projected at the first distance in front of the at least one eye; and/or
the at least one symbol being projected onto the at least one eye such that the user can virtually recognize the at least one symbol at the first distance in front of the at least one eye.

7. The method as claimed in claim 1 , wherein the at least one first distance is selected for an accommodated state of the at least one eye and the at least one second distance is selected for an unaccommodated state of the at least one eye, or wherein the at least one first distance is selected for an unaccommodated state of the at least one eye and the at least one second distance is selected for an accommodated state of the at least one eye.

8. The method as claimed in claim 1 , wherein for purposes of determining the vergence of the at least one eye, an eye rotation of the at least one eye is captured while the at least one eye is accommodated at the at least one first distance.

9. A computer program comprising executable instructions for carrying out a method for jointly determining accommodation and vergence of at least one eye of a user, the method comprising the following steps:
a) presenting at least one symbol at at least one first distance in front of at least one eye of a user for stimulating the accommodation of the at least one eye;
b) capturing at least one eye movement of the at least one eye; and
c) determining a refraction of the at least one eye with the accommodation of the at least one eye at the at least one first distance;
d) jointly determining the accommodation and the vergence of the at least one eye by:
determining a change in the refraction of the at least one eye with the accommodation of the at least one eye at the at least one first distance in relation to the accommodation of the at least one eye at at least one second distance; and
determining the vergence of the at least one eye from the at least one eye movement of the at least one eye with the accommodation of the at least one eye at the at least one first distance,

wherein the refraction of the at least one eye is determined by capturing the at least one eye movement of the at least one eye based on the at least one symbol while a parameter of the at least one symbol is altered, wherein a point in time is determined at which a recognition threshold of the user for the at least one symbol emerges from the at least one eye movement, wherein the refraction of the at least one eye is determined from the parameter for the at least one symbol defined at the point in time.

10. A computer-readable non-transitory data medium, on which the computer program as claimed in claim 9 is stored.

11. A computer-readable non-transitory storage medium comprising instructions that, upon execution by a computer, cause the latter to carry out the steps of a method for producing a spectacle lens for at least one eye of a user, wherein the spectacle lens is produced by processing a lens blank or a semi-finished spectacle lens product, wherein the lens blank or the semi-finished spectacle lens product is processed based on refraction data, wherein the refraction data take into account values for an accommodation and a vergence of at least one eye of the user, wherein a method for jointly determining the accommodation and the vergence of the eye of the user is used, the method for producing the spectacle lens comprising the following steps:
a) presenting at least one symbol at at least one first distance in front of at least one eye of a user for stimulating the accommodation of the at least one eye;
b) capturing at least one eye movement of the at least one eye; and
c) determining a refraction of the at least one eye with the accommodation of the at least one eye at the at least one first distance;
d) jointly determining the accommodation and the vergence of the at least one eye by:
determining a change in the refraction of the at least one eye with the accommodation of the at least one eye at the at least one first distance in relation to the accommodation of the at least one eye at at least one second distance; and
determining the vergence of the at least one eye from the at least one eye movement of the at least one eye with the accommodation of the at least one eye at the at least one first distance,

wherein the refraction of the at least one eye is determined by capturing the at least one eye movement of the at least one eye on the basis of the at least one symbol while a parameter of the at least one symbol is altered, wherein a point in time is determined at which a recognition threshold of the user for the at least one symbol emerges from the at least one eye movement, wherein the refraction of the at least one eye is determined from the parameter for the at least one symbol defined at the point in time.

12. An apparatus for jointly determining accommodation and vergence of at least one ey

Assignees

• Zeiss Carl Vision Int Gmbh

Inventors

• Leube Alexander
• Ohlendorf Arne
• Wahl Siegfried

Classifications

• A61B3/113

  for determining or recording eye movement · CPC title

• A61B3/09 Primary

  for testing accommodation · CPC title

• A61B3/0041

  characterised by display arrangements · CPC title

• A61B3/0025

  characterised by electronic signal processing, e.g. eye models · CPC title

• A61B3/028

  for testing visual acuity; for determination of refraction, e.g. phoropters · CPC title