Chromatic motion diagnosis system and methods

• US 5,485,230 A
• Filed: 05/03/1993
• Issued: 01/16/1996
• Est. Priority Date: 05/03/1993
• Status: Expired due to Fees

• Current Assignee: Administrators Of The Tulane Educational Fund (ADMINISTRATORS|DAVID H. COY)
• Original Assignee: Administrators Of The Tulane Educational Fund (ADMINISTRATORS|DAVID H. COY)
• Inventors: Zimmerman, George L.
• Primary Examiner(s): Nguyen, Viet Q.
• Application Number:
  US08/056,474
• Time in Patent Office: 988 Days
• Field of Search: 351/239, 351/243, 351/224, 351/242, 351/200, 351/246
• US Class Current: 351/239
• CPC Class Codes: A61B 3/06 for testing light sensitivity, e.g. adaptation; for testing colour vision

Abstract

A system and method are described for determining a subject'"'"'s perceived motion ability utilizing chromatic pathways. The equiluminant point between two selected colors is determined and two similar moving patterns are then provided, one equiluminant and the other luminant, the moving patterns consisting of only the two selected colors. The velocity of one pattern is held fixed while the velocity of the other pattern is matched to the fixed velocity by the subject. The difference between the matched velocity and the fixed velocity provides a measurement of the subject'"'"'s perceived motion ability along the chosen chromatic pathways as compared to a standard. The comparison shows how to enhance motion perception ability by modifying the spectrum of the light impinging the subject'"'"'s eyes in accordance with the comparison findings.

Claims

1. A method for determining a subject'"'"'s perceived motion ability utilizing only a chromatic pathway as compared to a luminance pathway, the method comprising the steps of:

a. selecting a first color and a second color which determine the chromatic pathway;

b. determining the equiluminant point of the subject with respect to the first and second colors;

c. providing a first moving pattern of the first color and the second color, the first and second colors of the first pattern being luminant with respect to each other;

d. providing a second moving pattern, the first and second colors of the second pattern being equiluminant with respect to each other;

e. maintaining one of the first and second patterns at a fixed velocity;

f. providing a means for adjusting the velocity of another one of the first and second patterns;

g. having the subject match the appearance of the adjustable velocity to the fixed velocity;

h. determining if a difference exists between the matched adjustable velocity and the fixed velocity, the difference being a determination oil the subject'"'"'s perceived motion ability utilizing only the chromatic pathway of the subject;

i. providing a motion perception standard; and

j. comparing the determination to the standard to evaluate the subject'"'"'s perceived motion ability.

2. The method of claim 1 wherein the first color is blue and the second color is yellow.

3. The method of claim 1 wherein the first color is red and the second color is green.

4. The method of claim 1 wherein the first and second patterns are sine wave patterns of the first and second colors with the first color 180 degrees out of phase with the second color.

24. The method of claim 1 wherein the first color is red and the second color is green, and further comprising the steps of performing steps a-h for blue and yellow colors.

25. The method of claim 1 further comprising, after step h, the steps of:

k) repeating step d with the substep of superimposing the second pattern over the first pattern;

l) maintaining the first and second patterns at a first fixed velocity;

m) setting one of the first and second patterns at a first fixed contrast;

n) providing the subject with means for adjusting a reference contrast of the other of the first and second patterns;

o) providing a third pattern of the first and second colors, the colors of the third pattern being luminant with respect to each other;

p) maintaining the third pattern at a fixed velocity slower than the first velocity but faster than the subject'"'"'s perceived velocity of the second pattern;

q) having the subject adjust the second reference contrast of the other of the first or second pattern until the first and second patterns appear to match the third pattern in velocity and measuring a first reference;

r) selecting a second fixed velocity for the first and second patterns;

s) repeating step j to obtain a second reference contrast; and

t) determining the ratio between the difference in the first and second reference contrasts to the difference in the first and second velocities, the ratio being a measure of the sensitivity of the overall motion perception to information from the chosen chromatic pathway.

5. A method for determining a subject'"'"'s perceived motion ability utilizing the red/green and the blue/yellow chromatic pathways, the method comprising the steps of:

selecting a red color and a green color which isolate the red/green chromatic pathway;

determining the equiluminant point of the subject with respect to the red and green colors;

providing a first moving pattern of the red color and the green color, the red and green colors of the first pattern being luminant with respect to each other;

providing a second moving pattern similar to the first pattern, the red and green colors of the second pattern being equiluminant with respect to each other;

maintaining one of the first and second patterns at a fixed velocity;

providing a means for adjusting the velocity of the other of the first and second patterns;

having the subject match the appearance of the adjustable velocity to the fixed velocity;

determining if a difference exists between the matched adjustable velocity and the fixed velocity, the difference being a determination of the subject'"'"'s perceived motion ability utilizing only the red/green chromatic pathway of the subject;

selecting a blue color and a yellow color which isolate the blue/yellow chromatic pathway;

determining the equiluminant point of the subject with respect to the blue and yellow colors;

providing a third moving pattern of the blue color and the yellow color, the blue and yellow colors of the third pattern being luminant with respect to each other;

providing a fourth moving pattern similar to the third pattern, the blue and yellow colors of the fourth pattern being equiluminant with respect to each other;

maintaining one of the third and fourth patterns at a fixed velocity;

providing a means for the subject to adjust the velocity of the other of the third and fourth patterns;

having the subject match the appearance of the adjustable velocity to the fixed velocity;

determining if a difference exists between the matched adjustable velocity and the fixed velocity, the difference being a determination of the subject'"'"'s perceived motion ability utilizing only the blue/yellow chromatic pathway of the subject;

providing a motion perception standard; and

comparing the determinations to the standard to evaluate the subject'"'"'s perceived motion ability.

6. The method of claim 5 wherein the step of determining the equiluminant point with respect to the blue and yellow colors includes the step of saturating the red and green cones of the subject.

7. A chromatic motion diagnostic system for determining a subject'"'"'s perceived motion ability utilizing a chromatic pathway, the system comprising:

a color projector;

a pattern generation system in electrical communication with the color projector, the pattern generation system generating moving patterns on the color projector;

means for adjusting the patterns generated on the color projector, the adjustment means in electrical communication with the pattern generation system and the color projector, the adjustments including velocity, luminosity, and contrast of the patterns.

8. The motion diagnostic system of claim 7 further comprising a monitor calibration circuit.

9. The motion diagnostic system of claim 8 wherein the monitor calibration circuit comprises a photometer and memory means in electrical communication with the pattern generation system, the pattern generation system generating a calibration pattern onto a specific location on the projector, the photometer being located at the specific location and the photometer measuring the calibration pattern intensities, the measured intensities being compared to expected intensities stored in the memory means, the monitor calibration circuit adjusting the pattern generation system to match the measured intensities to the expected intensities.

10. The motion diagnostic system of claim 7 wherein the pattern generation system is a computer.

11. The motion diagnostic system of claim 7 wherein the adjustment means is a mouse.

12. The motion diagnostic system of claim 7 wherein the color projector is a color monitor.

13. The motion diagnostic system of claim 7 further comprising means for isolating the blue/yellow chromatic pathway.

14. The motion diagnostic system of claim 13 wherein the isolating means comprises a blue filter having a spectral cutoff point of about 550 nanometers, a screen, the filter and the screen being positioned between the subject and the color projector, and an amber light source positioned to reflect amber light from the screen into the subject'"'"'s eyes, the reflected amber light being of sufficient intensity to saturate the red and green cones of the subject'"'"'s eyes.

15. The motion diagnostic system of claim 13 wherein the isolating means comprises a dichroic filter.

16. A method for comparing a subject'"'"'s perceived motion ability utilizing the red/green chromatic pathway versus the luminance pathway, the method comprising the steps of:

a) determining the equiluminant point of the subject with respect to the colors red and green;

b) providing a first moving pattern of the colors red and green, the red and green colors of the first pattern being luminant with respect to each other;

c) providing a second moving pattern similar to the first pattern, the red and green colors of the second pattern being equiluminant with respect to each other, the second pattern being superimposed over the first pattern;

d) maintaining the first and second patterns at a first fixed velocity but in opposite directions;

e) setting one of the first and second patterns at a first fixed contrast;

f) providing the subject with means for adjusting a reference contrast of the other of the first and second patterns;

g) having the subject adjust the reference contrast of the other of the first and second patterns until the combination of the first and second patterns appears to stop and measuring a first reference contrast;

h) selecting a second fixed velocity for the patterns and repeating step g to obtain a second reference contrast;

i) determining the ratio between the difference in the first and second reference contrasts to the difference in the first and second velocities, the ratio being a measure of the sensitivity of the overall motion perception to motion information from the red/green chromatic pathway;

j) providing a pathway balance standard ratio; and

k) comparing the determined ratio to the standard ratio to evaluate the subject'"'"'s perceived motion ability along the red/green chromatic and luminance pathways.

21. A method of treating disabilities relating to motion perception, the method comprising the steps of:

determining the subject'"'"'s perceived motion ability utilizing the red/green and blue/yellow chromatic pathways as described in claim 5;

comparing the subject'"'"'s perceived motion ability utilizing the red/green chromatic pathway versus the luminance pathway as described in claim 16;

comparing the subject'"'"'s perceived motion ability utilizing the blue/yellow chromatic pathway versus the luminance pathway as described in claim 17;

determining which chromatic pathway interferes with the subject'"'"'s motion perception abilities; and

modifying the spectrum of the light impinging upon the subject'"'"'s eyes to minimize the effect of the interfering pathway.

22. The method of claim 21 wherein the disability is dyslexia where the individual demonstrates improvement in comprehension and reading speed with color changes and the motion perception standard and the pathway balance standard are derived from the general population.

23. The method of claim 22 wherein the step of modifying the spectrum further comprises providing tinted lenses to the subject which filter out the interfering pathway.

17. A method for comparing a subject'"'"'s perceived motion ability utilizing the blue/yellow chromatic pathway versus the luminance pathway, the method comprising the steps of:

a) determining the equiluminant point of the subject with respect to the colors blue and yellow;

b) providing a first moving pattern of the colors blue and yellow, the blue and yellow colors of the first pattern being luminant with respect to each other;

c) providing a second moving pattern similar to the first pattern, the blue and yellow colors of the second pattern being equiluminant with respect to each other, the second pattern being superimposed over the first pattern;

d) maintaining the first and second patterns at a first fixed velocity but in opposite directions;

e) setting one of the first and second patterns at a first fixed contrast;

f) providing the subject with means for adjusting a reference contrast of the other of the first and second patterns;

g) having the subject adjust the reference contrast until the combination of the first and second patterns appears to stop and measuring a first reference contrast;

h) selecting a second fixed velocity for the patterns and repeating step g to obtain a second reference contrast;

i) determining the ratio between the difference in the first and second reference contrasts to the difference in the first and second velocities, the ratio being a measure of the sensitivity of the overall motion perception to motion information from the blue/yellow chromatic pathway;

j) providing a pathway balance standard ratio; and

k) comparing the determined ratio to the standard ratio to evaluate the subject'"'"'s perceived motion ability along the blue/yellow chromatic and luminance pathways.

18. A method for comparing a subject'"'"'s perceived motion ability utilizing a chosen chromatic pathway versus the luminance pathway, the method comprising the steps of:

a) determining the equiluminant point of the subject with respect to a first and second color for the chosen pathway;

b) providing a first moving pattern of the first and second colors, the colors of the first pattern being luminant with respect to each other;

c) providing a second moving pattern similar to the first pattern, the first and second colors of the second pattern being equiluminant with respect to each other, the second pattern being superimposed over the first pattern;

d) maintaining the first and second patterns at a first fixed velocity;

e) setting one of the first and second patterns at a first fixed contrast;

f) providing the subject with means for adjusting a reference contrast of the other of the first and second patterns;

h) providing a third pattern of the first and second colors, the colors of the third pattern being luminant with respect to each other;

i) maintaining the third pattern at a fixed velocity slower than the first velocity but faster than the subject'"'"'s perceived velocity of the-second pattern;

j) having the subject adjust the second reference contrast of the other of the first or second pattern until the first and second patterns appear to match the third pattern in velocity and measuring a first reference;

k) selecting a second fixed velocity for the first and second patterns;

l) repeating step j to obtain a second reference contrast; and

m) determining the ratio between the difference in the first and second reference contrasts to the difference in the first and second velocities, the ratio being a measure of the sensitivity of the overall motion perception to information from the chosen chromatic pathway.

19. A method for comparing a subject'"'"'s perceived motion ability utilizing the blue/yellow chromatic pathway versus the luminance pathway, the method comprising the steps of:

a) providing a first moving pattern of blue and a color which does not include blue;

b) providing a second moving pattern of two colors which are luminant with regard to each other;

c) maintaining one of the first and second patterns at a first fixed velocity and the other at another fixed velocity, with the velocity of the first pattern being greater than the second;

d) providing isolating means for adjustably isolating the blue/yellow chromatic pathway from the first pattern;

e) having the subject adjust the isolating means until the patterns appear matched in velocity, the adjustment providing a first reference measurement;

f) selecting a second fixed velocity for either the first or second pattern;

g) having the subject adjust the isolating means until the patterns appear matched in velocity, the adjustment providing a second reference measurement; and

h) determining the ratio of the differences in the first and second reference measurements to the differences in the first and second velocities, the ratio being a measure of the sensitivity of the overall motion perception to motion information for the blue/yellow chromatic pathway.

20. The method of claim 19 wherein the isolating means includes a blue filter between the subject and the first pattern and an amber light source positioned to direct light into the subject'"'"'s eyes, the intensity of the amber light source being adjustable.

26. A method of determining components of a subject'"'"'s perceived motion ability comprising the steps of:

a) generating at least two patterns to be displayed on a display device, each pattern having parameters that include velocity, luminosity and contrast;

b) maintaining a first magnitude one of the parameters of a first one of the patterns fixed;

c) having the subject adjust a second magnitude of a corresponding parameter in another one of the patterns with reference to the first one of the patterns; and

d) determining the difference between the fixed first magnitude and the adjusted second magnitude.