BINOCULAR VISUAL PERFORMANCE MEASURING METHOD, BINOCULAR VISUAL PERFORMANCE MEASURING PROGRAM, EYEGLASS LENS DESIGN METHOD AND EYEGLASS LENS MANUFACTURING METHOD

• US 20120105609A1
• Filed: 10/27/2011
• Published: 05/03/2012
• Est. Priority Date: 10/29/2010
• Status: Active Grant

• Current Assignee: Hoya Corporation
• Original Assignee: Hoya Corporation
• Inventors: QI, Hua
• Granted Patent: US 9,259,146 B2
• Time in Patent Office: Days
• US Class Current: 348/54
• CPC Class Codes: A61B 3/08 for testing binocular or stereoscopic vision, e.g. strabismus
• CPC Class Codes: Y10T 29/49764 with testing or indicating

Abstract

A binocular visual performance measuring method including: a parallax image displaying step of displaying left and right parallax images at a predetermined measurement start position on a display screen when a measurement item is designated; a parallax image changing step of changing one of the left and right parallax images relative to the other of the left and right parallax images in accordance with the designated measurement item; a timing detecting step of detecting a timing when the subject viewing the left and right parallax images from a position a predetermined distance away from the display screen becomes unable to achieve fusion of the left and right parallax images; and a measurement value calculating step of calculating a measurement value of the designated measurement item based on the predetermined distance and a difference between the left and right parallax images defined at the detected timing.

Claims

1. A binocular visual performance measuring method for measuring binocular visual performance using a stationary 3D video monitor having a display screen on which images for enabling a subject to perform stereoscopic viewing through binocular parallax are displayed, the method comprising:

a parallax image displaying step of displaying left and right parallax images at a predetermined measurement start position on the display screen when a measurement item of the binocular visual performance is designated;

a parallax image changing step of changing one of the left and right parallax images relative to the other of the left and right parallax images in accordance with the designated measurement item;

a timing detecting step of detecting a timing when the subject viewing the left and right parallax images from a position a predetermined distance away from the display screen becomes unable to achieve fusion of the left and right parallax images; and

a measurement value calculating step of calculating a measurement value of the designated measurement item based on the predetermined distance and a difference between the left and right parallax images defined at the detected timing.

2. The binocular visual performance measuring method according to claim 1,

further comprising:

a start position changing step of changing the predetermined measurement start position each time the measurement value is calculated,

wherein the parallax image changing step, the timing detecting step and the measurement value calculating step are executed in this order while displaying the left and eight parallax images at the changed predetermined measurement position, and the measurement value is obtained for the designated measurement item for each of the changed predetermined measurement start positions.

3. The binocular visual performance measuring method according to claim 1,

wherein:

the designated measurement item is a relative convergence;

in the parallax image changing step, the left and right parallax images are shifted in a horizontal direction on the display screen to approach to or depart from each other; and

in the measurement value calculating step, the relative convergence of the subject is calculated based on the predetermine distance and a position shift amount in the horizontal direction between the left and right parallax images defined at the detected timing.

4. The binocular visual performance measuring method according to claim 1,

wherein:

the designated measurement item is a left and right eye vertical divergence permissible value which is a permissible value of a vertical divergence of left and right eyes capable of performing stereoscopic viewing;

in the parallax image changing step, the left and right parallax images are shifted in a vertical direction on the display screen to approach to or depart from each other; and

in the measurement value calculating step, the left and right eye vertical divergence permissible value of the subject is calculated based on the predetermine distance and a position shift amount in the vertical direction between the left and right parallax images defined at the detected timing.

5. The binocular visual performance measuring method according to claim 1,

the designated measurement item is a first unequal magnification permissible value which is a permissible value of an unequal magnification of left and right eyes capable of performing stereoscopic viewing;

in the parallax image changing step, a display magnification of at least one of the left and right parallax images is changed in a fixed aspect ratio so that display magnifications of the left and right parallax images change relative to each other;

in the measurement value calculating step, the first unequal magnification permissible value of the subject is calculated based on the predetermine distance and a ratio between the display magnifications of the left and right parallax images defined at the detected timing.

6. The binocular visual performance measuring method according to claim 1,

the designated measurement item is a second unequal magnification permissible value which is a permissible value of an unequal magnification defined in a particular direction for left and right eyes capable of performing stereoscopic viewing;

in the parallax image changing step, a display magnification of at least one of the left and right parallax images is changed only in the particular direction so that display magnifications of the left and right parallax images change relative to each other in the particular direction;

in the measurement value calculating step, the second unequal magnification permissible value of the subject is calculated based on the predetermine distance and a ratio between the display magnifications of the left and right parallax images defined at the detected timing.

7. The binocular visual performance measuring method according to claim 1,

the designated measurement item is a left and right eye rotation parallax permissible value which is a permissible value of a rotation parallax of left and right eyes capable of performing binocular visual performance;

in the parallax image changing step, at least one of the left and right parallax images is rotated about a barycenter thereof so that rotational angles of the left and right parallax images change relative to each other;

in the measurement value calculating step, the left and right eye rotation parallax permissible value of the subject is calculated based on the predetermine distance and a difference between the rotational angles of the left and right parallax images defined at the detected timing.

8. The binocular visual performance measuring method according to claim 1,

further comprising:

a distance changing step of changing the predetermined distance,

wherein the parallax image changing step, the timing detecting step and the measurement value calculating step are executed for each of the changed predetermined distances so that the measurement value of the designated measurement item is obtained for each of the changed predetermined distances.

10. An eyeglass design method, comprising:

measuring binocular visual performance of a subject using the binocular visual performance measuring method according to claim 1; and

determining optical design values of eyeglass lenses based on a measurement result of the binocular visual performance.

11. An eyeglass lens manufacturing method, comprising:

designing eyeglass lenses using the eyeglass design method according to claim 10; and

manufacturing the eyeglass lenses according to a design result of the eyeglass lenses.

9. A computer readable medium having computer readable instruction stored thereon, which, when executed by a processor of a computer, configures the processor to perform:

a parallax image displaying step of displaying left and right parallax images at a predetermined measurement start position on a display screen when a measurement item of the binocular visual performance is designated;

a parallax image changing step of changing one of the left and right parallax images relative to the other of the left and right parallax images in accordance with the designated measurement item;

a timing detecting step of detecting a timing when the subject viewing the left and right parallax images from a position a predetermined distance away from the display screen becomes unable to achieve fusion of the left and right parallax images; and

a measurement value calculating step of calculating a measurement value of the designated measurement item based on the predetermined distance and a difference between the left and right parallax images defined at the detected timing.

12. A binocular visual performance measuring method for measuring binocular visual performance using a stationary 3D video monitor having a display screen on which images for enabling a subject to perform stereoscopic viewing through binocular parallax are displayed, the method comprising:

a parallax image displaying step of displaying left and right parallax images at a predetermined measurement start position on the display screen when a plurality of types of measurement items of the binocular visual performance are designated;

a parallax image changing step of changing one of the left and right parallax images relative to the other of the left and right parallax images in a compositive changing style in which changing patterns respectively corresponding to the plurality of types of designated measurement items are combined;

a timing detecting step of detecting a timing when the subject viewing the left and right parallax images from a position a predetermined distance away from the display screen becomes unable to achieve fusion of the left and right parallax images; and

a measurement value calculating step of calculating a compositive measurement value of the plurality of types of designated measurement items based on the predetermined distance and a difference between the left and right parallax images defined at the detected timing.

13. The binocular visual performance measuring method according to claim 12,

further comprising:

a start position changing step of changing the predetermined measurement start position each time the compositive measurement value of the plurality of types of designated measurement items is calculated,

wherein the parallax image changing step, the timing detecting step and the measurement value calculating step are executed in this order while displaying the left and eight parallax images at the changed predetermined measurement position, and the compositive measurement value is obtained for the plurality of types of designated measurement items for each of the changed predetermined measurement start positions.

14. The binocular visual performance measuring method according to claim 12,

wherein the plurality of types of measurement items include at least two of a relative convergence, a left and right eye vertical divergence permissible value which is a permissible value of a vertical divergence of left and right eyes capable of performing stereoscopic viewing, a first unequal magnification permissible value which is a permissible value of an unequal magnification of left and right eyes capable of performing stereoscopic viewing, a second unequal magnification permissible value which is a permissible value of an unequal magnification defined in a particular direction for left and right eyes capable of performing stereoscopic viewing, a left and right eye rotation parallax permissible value which is a permissible value of a rotation parallax of left and right eyes capable of performing stereoscopic viewing.

15. The binocular visual performance measuring method according to claim 14,

wherein:

the plurality of types of designated measurement items are the relative convergence and the left and right eye vertical divergence permissible value;

in the parallax image changing step, the left and right parallax images are shifted in a slanting direction on the display screen to approach to or depart from each other, the slanting direction being defined by combining a horizontal direction component and a vertical direction component on the display screen; and

in the measurement value calculating step, the compositive measurement value of the relative convergence and the left and right eye vertical divergence permissible value is calculated based on the predetermine distance and a position shift amount between the left and right parallax images defined at the detected timing.

16. The binocular visual performance measuring method according to claim 15,

wherein:

the plurality of types of designated measurement items further includes one of the first unequal magnification permissible value and the second unequal magnification permissible value;

in the parallax image changing step, display magnifications of the left and right parallax images are changed relative to each other while moving the left and right parallax images in the slanting direction on the display screen to approach to or depart from each other; and

in the measurement value calculating step, the compositive measurement value of the relative convergence, the left and right eye vertical divergence permissible value, and one of the first unequal magnification permissible value and the second unequal magnification permissible value is calculated based on the predetermine distance and a position shift amount and a rotation angle difference between the left and right parallax images defined at the detected timing.

17. The binocular visual performance measuring method according to claim 14,

wherein:

the plurality of types of designated measurement items are the relative convergence and the left and right eye rotation parallax permissible value;

in the parallax image changing step, at least one of the left and right parallax images is rotated about a barycenter thereof so that rotational angles of the left and right parallax images change relative to each other while shifting the left and right parallax images in a horizontal direction on the display screen to approach to or depart from each other;

in the measurement value calculating step, the compositive measurement value of the relative convergence and the left and right eye rotation parallax permissible value is calculated based on the predetermine distance and a position shift amount and a rotation angle difference between the left and right parallax images defined at the detected timing.

18. The binocular visual performance measuring method according to claim 12,

further comprising:

a distance changing step of changing the predetermined distance,

wherein the parallax image changing step, the timing detecting step and the measurement value calculating step are executed for each of the changed predetermined distances so that the compositive measurement value of the plurality of designated measurement items is obtained for each of the changed predetermined distances.

20. An eyeglass design method, comprising:

measuring binocular visual performance of a subject using the binocular visual performance measuring method according to claim 12; and

determining optical design values of eyeglass lenses based on a measurement result of the binocular visual performance.

21. An eyeglass lens manufacturing method, comprising:

designing eyeglass lenses using the eyeglass design method according to claim 20; and

manufacturing the eyeglass lenses according to a design result of the eyeglass lenses.

19. A computer readable medium having computer readable instruction stored thereon, which, when executed by a processor of a computer, configures the processor to perform:

a parallax image displaying step of displaying left and right parallax images at a predetermined measurement start position on a display screen when a plurality of types of measurement items of the binocular visual performance are designated;

a parallax image changing step of changing one of the left and right parallax images relative to the other of the left and right parallax images in a compositive changing style in which changing patterns respectively corresponding to the plurality of types of designated measurement items are combined;

a timing detecting step of detecting a timing when the subject viewing the left and right parallax images from a position a predetermined distance away from the display screen becomes unable to achieve fusion of the left and right parallax images; and

a measurement value calculating step of calculating a compositive measurement value of the plurality of types of designated measurement items based on the predetermined distance and a difference between the left and right parallax images defined at the detected timing.