System and method for determining the impact of peripheral optical errors on patient locomotion

Patent metadata

Field	Value
Publication number	US-12360637-B2
Application number	US-202318478835-A
Country	US
Kind code	B2
Filing date	Sep 29, 2023
Priority date	Sep 29, 2022
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

A method of quantifying the effect of peripheral optical errors on patient locomotion includes projecting a pattern on the floor that includes a discrete shapes and empty spaces between the discrete shapes. The method also includes tracking a position of the participant along the pattern as the participant traverses the pattern, and determining foot placement accuracy, utilizing a optical motion capture system and a computer, as the participant walked through the pattern by determining a total area of overlap between the participant's feet and the empty spaces of the pattern. In another embodiment, the method includes arranging obstacles in front of a participant, intermittently displaying a character in front of the participant, determining participant's accuracy in identifying or counting the characters, and determining the participant's step length and foot clearance as the participant steps over the obstacles to quantify the effect of the peripheral optical errors on the participant's locomotion.

First claim

What is claimed is:

1. A method of quantifying an effect of peripheral optical errors on patient locomotion, the method comprising:
projecting, from an overhead video projector, a pattern on a floor in front of a participant, the pattern comprising a plurality of discrete shapes and a plurality of empty spaces between the plurality of discrete shapes;
tracking, with an optical motion capture system, a position of the participant along the pattern as the participant traverses the pattern;
determining foot placement accuracy, utilizing the optical motion capture system and a computer, as the participant walked through the pattern by determining a total area of overlap between the participant's feet and the plurality of empty spaces of the pattern; and
quantifying the effect of the peripheral optical errors on the patient's locomotion based on the foot placement accuracy.

2. The method of claim 1 , wherein the projecting the pattern on the floor comprises dynamically revealing portions of the pattern in front of the participant as the participant traverses the pattern.

3. The method of claim 2 , further comprising dynamically changing a rate at which the pattern is revealed in front of the participant based on a stride of the participant.

4. The method of claim 2 , wherein a length of the portion of the pattern that is dynamically revealed in front of the participant is substantially equal to two strides of the participant.

5. The method of claim 1 , wherein the plurality of discrete shapes comprises a plurality of squares.

6. The method of claim 1 , further comprising announcing, by a speaker, an instruction for the participant to start walking through the pattern with a left foot first or a right foot first.

7. The method of claim 1 , further comprising changing a contrast of the pattern, and repeatedly determining the participant's foot placement accuracy for each different contrast of the pattern.

8. The method of claim 7 , further comprising changing ambient lighting, and repeatedly determining the participant's foot placement accuracy for each different illuminance of the ambient lighting.

9. The method of claim 1 , further comprising changing a configuration of the pattern, and repeatedly determining the participant's foot placement accuracy for each different configuration of the pattern.

10. The method of claim 9 , further comprising conducting a baseline test of the participant's walk without the pattern on the floor to determine the participant's natural stride and walking speed, and wherein the configuration of the pattern is based on the participant's natural stride and walking speed.

11. The method of claim 10 , wherein the configuration of the pattern is further based on a shoe size of the participant.

12. A method of quantifying an effect of peripheral optical errors on patient locomotion, the method comprising:
arranging, on a floor, a plurality of obstacles in front of a participant;
intermittently displaying, on a display centered in front of the participant, at least one character;
determining an accuracy of the participant to correctly identify or count each of the at least one character intermittently displayed on the display as the participant traverses the plurality of obstacles;
tracking, with an optical motion capture system, a position of the participant as the participant traverses the plurality of obstacles;
determining, with the optical motion capture system and a computer, a clearance between each of the plurality of obstacles and a foot of the participant as the participant stepped over the plurality of obstacles;
determining, with the optical motion capture system and the computer, a step length of the participant as the participant stepped over the plurality of obstacles; and
quantifying the effect of the peripheral optical errors on the participant's locomotion based on an increase in at least one of the clearance and the step length.

13. The method of claim 12 , discarding the effect in response to the participant not identifying or counting each of the at least character displayed on the display within a threshold accuracy.

14. The method of claim 12 , further comprising concealing, with a movable barrier, the plurality of obstacles until the participant begins walking.

15. The method of claim 12 , wherein the intermittently displaying comprises randomly displaying a particular letter on the display.

16. The method of claim 12 , wherein the intermittently displaying the at least one character comprises reducing a size of the at least one character as the participants moves toward the display to maintain a same visual angle of the participant occupied by the at least character.

17. The method of claim 12 , further comprising changing a configuration of the plurality of obstacles, and repeatedly determining the clearance and the step length for each different configuration of the plurality of obstacles.

18. The method of claim 12 , further comprising changing a location of a least one of the plurality of obstacles, and repeatedly determining the clearance and the step length for each different location of the plurality of obstacles.

Assignees

• Amo Groningen Bv

Inventors

• Reints Roy
• Van Der Mooren Marrie
• Canovas Vidal Carmen
• Zenouda Ariel
• Liu Yichao
• Reeves Christopher
• Rosen Robert

Classifications

• G06F3/011

  Arrangements for interaction with the human body, e.g. for user immersion in virtual reality (blind teaching G09B21/00) · CPC title

• A61B5/1104

  induced by stimuli or drugs (A61B5/1102 takes precedence) · CPC title

• A61B5/1124

  Determining motor skills · CPC title

• A61B3/024

  for determining the visual field, e.g. perimeter types · CPC title

• G06F3/0425 Primary

  using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected (tracking a projected light spot to determine a position on a display surface G06F3/0386) · CPC title