Device and method for measuring at least one objective ocular refraction characteristic of a patient for a plurality of visual ranges

Patent metadata

Field	Value
Publication number	US-9585552-B2
Application number	US-201314411933-A
Country	US
Kind code	B2
Filing date	Jul 4, 2013
Priority date	Jul 6, 2012
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A device for measuring the objective ocular refraction of a patient for a plurality of visual ranges, which includes a variable proximity optical sight system capable of selectively generating a first target and a second target and an image-capturing device having an optical measurement axis intended for being aligned with a line of sight of the patient, the image-capturing device being capable of capturing a first ocular refraction image when the first target is activated and a second ocular refraction image when the second target is activated. The image-capturing device and the optical sight system are arranged such that the optical measurement axis and the optical sight axis are arranged such that the optical measurement axis and the optical sight axis are contained in a single plane and the optical measurement axis is tilted at an angle alpha between +5 degrees and +85 degrees relative to the horizontal.

First claim

The invention claimed is:

1. A binocular device for measuring at least one objective ocular refraction characteristic of a subject for a plurality of vision distances, comprising:
an optical system for generating a focus of variable proximity, able to generate selectively a first target having a first proximity value P 1 and at least one second target having a second proximity value P 2 , said first target and said second target being centered on one and the same focus optical axis;
at least one light source able to generate at least one illuminating beam in the direction of the two eyes of the subject;
an image-capturing apparatus, said apparatus having a measurement optical axis aligned with a gaze axis of the subject, the angle between the measurement optical axis and the focus optical axis being smaller than 10 degrees, said apparatus being suitable for receiving an ocular refraction beam by refraction of the at least one illuminating beam in the eyes of the subject, the image-capturing apparatus being suitable for capturing a first ocular refraction image of the two eyes when the first target of proximity P 1 is activated and at least one second ocular refraction image of the two eyes when the second target of proximity P 2 is activated as a function of lowering of the gaze relative to the head of the subject; and
a processor suitable for receiving the first ocular refraction image and the second ocular refraction image in order to deduce therefrom a measurement of at least one objective ocular refraction characteristic of the two eyes of the subject depending on the first proximity value P 1 and the second proximity value P 2 ,
a case holding the focus-generating optical system, the at least one light source and the image-capturing apparatus,
the focus optical axis being inclined at an angle alpha to the horizontal, the angle alpha being comprised between +5 degrees and +85 degrees when the case is placed on a horizontal surface, and
the image-capturing apparatus and the processor being suitable for measuring pupillary distances for the first proximity value P 1 and for the second proximity value P 2 and/or at least one fitting parameter among height, pantoscopic angle, eye/glass distance and the position of the center of rotation of the eye.

2. The measuring device as claimed in claim 1 , further comprising:
means for moving and/or orienting the focus optical axis so as to align the measurement optical axis with the axis of the gaze of the subject.

3. The measuring device as claimed in claim 1 , further comprising:
means for measuring the distance between said device and the head of the subject, said means for measuring distance being chosen from: a telemeter, an image-processing system based on image quality, an image-processing system based on the measurement of reference marks mounted on a clip fastened to a frame, a gauging system or a system for measuring distance by ultrasound.

4. The measuring device as claimed in claim 1 , wherein the at least one light source comprises at least one infrared source and in which the image-capturing apparatus is able to capture images in the infrared.

5. The measuring device as claimed in claim 1 , further comprising:
an optical beam splitter placed on the optical path between the subject and the at least one source, the image-capturing apparatus, the optical beam splitter being able to combine the illuminating beam and the first target or the second target on the focus optical axis in the direction of the eyes of the subject, said beam splitter being able to direct the ocular refraction beam toward the image-capturing apparatus on the measurement optical axis.

6. The measuring device as claimed in claim 5 , wherein the optical beam splitter comprises a dichroic mirror able to transmit the infrared illuminating beam and reflect the target beam.

7. The measuring device as claimed in claim 1 , wherein the measurement optical axis and the focus optical axis are coincident.

8. The measuring device as claimed in claim 1 , wherein the image-capturing apparatus is suitable for forming an image of the face of the subject on an object field having a diameter of at least 50 mm.

9. The measuring device as claimed in claim 2 , further comprising:
means for measuring the distance between said device and the head of the subject, said means for measuring distance being chosen from: a telemeter, an image-processing system based on image quality, an image-processing system based on the measurement of reference marks mounted on a clip fastened to a frame, a gauging system or a system for measuring distance by ultrasound.

10. The measuring device as claimed in claim 2 , wherein the at least one light source comprises at least one infrared source and wherein the image-capturing apparatus is able to capture images in the infrared.

11. The measuring device as claimed in claim 3 , wherein the at least one light source comprises at least one infrared source and wherein the image-capturing apparatus is able to capture images in the infrared.

12. The measuring device as claimed in claim 2 , further comprising:
an optical beam splitter placed on the optical path between the subject and the at least one source, the image-capturing apparatus, the optical beam splitter being able to combine the illuminating beam and the first target or the second target on the focus optical axis in the direction of the eyes of the subject, said beam splitter being able to direct the ocular refraction beam toward the image-capturing apparatus on the measurement optical axis.

13. The measuring device as claimed in claim 3 , further comprising:
an optical beam splitter placed on the optical path between the subject and the at least one source, the image-capturing apparatus, the optical beam splitter being able to combine the illuminating beam and the first target or the second target on the focus optical axis in the direction of the eyes of the subject, said beam splitter being able to direct the ocular refraction beam toward the image-capturing apparatus on the measurement optical axis.

14. The measuring device as claimed in claim 4 , further comprising:
an optical beam splitter placed on the optical path between the subject and the at least one source, the image-capturing apparatus, the optical beam splitter being able to combine the illuminating beam and the first target or the second target on the focus optical axis in the direction of the eyes of the subject, said beam splitter being able to direct the ocular refraction beam toward the image-capturing apparatus on the measurement optical axis.

15. The measuring device as claimed in claim 4 , wherein the image-capturing apparatus is suitable for forming an image of the face of the subject on an object field having a diameter of at least 50 mm.

16. The measuring device as claimed in claim 5 , wherein the image-capturing apparatus is suitable for forming an image of the face of the subject on an object field having a diameter of at least 50 mm.

17. The measuring device as claimed in claim 6 , wherein the image-capturing apparatus is suitable for forming an image of the face of the subject on an object field having a diameter of at least 50 mm.

Assignees

• Essilor Int

Inventors

• Baranton Konogan
• Rousseau Benjamin
• Divo Fabien
• Escalier Guilhem

Classifications

• A61B3/0091 Primary

  Fixation targets for viewing direction · CPC title

• G02C13/005

  Measuring geometric parameters required to locate ophtalmic lenses in spectacles frames (apparatus for testing or instruments for examining the eyes per se A61B3/00; machines or devices and accessories for grinding the edges of lenses using spectacles as a template B24B9/144) · CPC title

• A61B3/09

  for testing accommodation · CPC title

• A61B3/08

  for testing binocular or stereoscopic vision, e.g. strabismus · CPC title

• A61B3/103

  for determining refraction, e.g. refractometers, skiascopes · CPC title