Method and system for determining the subjective refraction properties of an eye

Patent metadata

Field	Value
Publication number	US-10327630-B2
Application number	US-201815934263-A
Country	US
Kind code	B2
Filing date	Mar 23, 2018
Priority date	Sep 23, 2015
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

A system determines the subjective refraction properties of an eye of a test subject perceiving a natural image. The system contains a memory in which at least one natural image is stored; a display device for displaying the at least one natural image from the memory; and a lens arrangement for adjusting various light-refracting elements in an optical path between the eye of the test subject and the display device. The lens arrangement is arranged at a predefined distance from the display device. A corresponding method and the use of a natural image for refraction determination are also disclosed.

First claim

The invention claimed is:

1. A system for determining the subjective refraction properties of an eye of a subject based on a utilization of a natural image, the system comprising:
a memory device configured to store at least one natural image;
a display apparatus configured to display the at least one natural image stored in the memory device; and
an optics arrangement configured to insert at least one light-refracting element from a plurality of light-refracting elements into an optical path between the subject's eye and the display apparatus;
wherein the optics arrangement is arranged at a predetermined distance from the display apparatus, and
wherein the natural image includes at least two regions having different spatial frequencies, respectively, and
wherein the natural image depicts a natural scenery.

2. The system as claimed in claim 1 , wherein the natural image has a spatial-frequency-dependent contrast, and
wherein the contrast decreases as the spatial frequency increases.

3. The system as claimed in claim 2 , wherein the contrast is inversely proportional to the spatial frequency.

4. The system as claimed in claim 2 , wherein the contrast of the natural image is elevated for higher spatial frequencies.

5. The system as claimed in claim 1 , wherein the natural image comprises a distribution of spatial frequencies including a plurality of spatial frequencies required for determining subjective refraction properties of the subject's eye in one image.

6. The system as claimed in claim 1 , wherein the natural image depicts structures with different spatial frequencies, and
wherein the spatial frequency distribution, upon observation at the predetermined distance, includes at least one spatial frequency of less than or equal to 0.3 cycles per degree and at least one spatial frequency greater than or equal to 60 cycles per degree.

7. The system as claimed in claim 1 , further comprising:
a selection device for selecting the natural image in accordance with a preference of the subject.

8. The system as claimed claim 1 , wherein the natural image includes at least one alien component.

9. The system as claimed in claim 1 , wherein at least one vision symbol is at least partially integrated in the natural image.

10. The system as claimed in claim 1 , wherein the display apparatus has a curved display surface.

11. The system as claimed in claim 1 , further comprising means:
for capturing a head movement of the subject, an eye movement of the subject, or the head movement and the eye movement.

12. The system as claimed in claim 1 , wherein the natural image is a video.

13. The system as claimed in claim 1 , further comprising:
an eccentric photorefractor.

14. A method for determining subjective refraction properties of an eye of a subject perceiving a natural image, the method comprising:
providing a system configured to determine the subjective refraction properties of an eye of a subject perceiving a natural image, the system including:
a memory device configured to store at least one natural image;
a display apparatus configured to display the at least one natural image stored on the memory device; and
an optics arrangement configured to insert at least one light-refracting element from a plurality of light-refracting elements in an optical path between the subject's eye and the display apparatus;

arranging the optics arrangement at a predetermined distance from the display apparatus;
displaying the at least one natural image stored in the memory device on the display apparatus;
placing different light-refracting elements from the plurality of light elements in the optical path between the subject's eye and the display apparatus with the optics arrangement; and
providing the natural image with at least two regions having different spatial frequencies, wherein the natural image depicts a natural scenery.

15. The system as claimed in claim 4 , wherein the contrast of the natural image is elevated to a contrast level of the natural scenery depicted by the natural image.

16. The system as claimed in claim 5 , wherein the distribution of spatial frequencies includes all spatial frequencies required for determining subjective refraction properties of the subject's eye in one image.

17. The system as claimed in claim 6 , wherein the natural image depicts structures with different spatial frequencies, wherein the spatial frequency distribution, upon observation at the predetermined distance, has at least one spatial frequency of less than or equal to 0.01 cycles per degree and at least one spatial frequency greater than or equal to 80 cycles per degree.

18. A system for determining the subjective refraction properties of an eye of a subject based on a utilization of a natural image, the system comprising:
a memory device configured to store at least one natural image;
a display apparatus configured to display the at least one natural image stored in the memory device; and
an optics arrangement configured to insert at least one light-refracting element from a plurality of light-refracting elements into an optical path between the subject's eye and the display apparatus;
wherein the optics arrangement is arranged at a predetermined distance from the display apparatus, and
wherein the natural image includes a plurality of image regions, wherein different image regions have different spatial frequencies and wherein the natural image depicts a natural scenery.

19. A method for determining subjective refraction properties of an eye of a subject perceiving a natural image, the method comprising:
providing a natural image with a plurality of image regions;
displaying the natural image to the subject at a first distance;
arranging a first light-refracting element at a second distance in an optical path between the subject's eye and the natural image;
replacing the first light-refracting element with a second light-refracting element at the second distance in the optical path between the subject's eye and the natural image;
receiving a description of at least one image region from among the plurality of image regions from the subject; and
determining the subjective refraction properties of the eye of the subject perceiving the natural image, wherein different image regions from among the plurality of image regions have different spatial frequencies and wherein the natural image depicts a natural scenery.

Assignees

• Zeiss Carl Vision Int Gmbh

Inventors

• Ohlendorf Arne
• Wahl Siegfried
• Cabeza Guillén Jesús-Miguel

Classifications

• A61B3/032 Primary

  Devices for presenting test symbols or characters, e.g. test chart projectors (A61B3/036 takes precedence) · CPC title

• A61B3/04

  Trial frames; Sets of lenses for use therewith · CPC title

• A61B3/0041 Primary

  characterised by display arrangements · CPC title

• A61B3/0285 Primary

  Phoropters · CPC title