Dynamic ocular visual monitoring system

• US 20040015098A1
• Filed: 07/19/2002
• Published: 01/22/2004
• Est. Priority Date: 07/19/2002
• Status: Abandoned Application

• Current Assignee: Philippe A. Souvestre
• Original Assignee: Philippe A. Souvestre
• Inventors: Souvestre, Philippe A.
• Application Number:
  US10/200,563
• Publication Number:
  US 20040015098A1
• Time in Patent Office: Days
• US Class Current: 600/558
• CPC Class Codes: A61B 3/113 for determining or recording eye movement

Abstract

A medical device for capturing eye movement in response to a moving target (20) includes a camera (40) for capturing images of the eye while the eye is focused on the moving target (20). A movement system (86) controls the motion of the target (20). One or more communication interfaces (110) communicate with external devices. The external devices may include a computing device (115) or a recording device (90) for recording the image and target position data. Computing device (115) may include computer executable software components for controlling the movement system (86) and analyzing the images captured by the camera (40), including determining the position of the center of the pupil within each image and plotting that position against the corresponding position of the target (20) when the image was captured.

Claims

1. A medical device for capturing eye movement in response to a moving target, comprising:

a. a camera for capturing images of at least one eye focused on at least one eye; and

b. a movement system for supporting a target and moving the target relative to at least one eye;

c. wherein the camera captures images of at least one eye as the movement system moves the target relative to at least one eye.

2. The medical device of claim 1, wherein the movement system is coupled to a movement system controller for controlling the movement of the movement system.

3. The medical device of claim 2, wherein the movement system controller periodically records the position of the target as the movement system moves the target.

4. The medical device of claim 2, wherein the movement system controller comprises a computing device.

5. The medical device of claim 4, wherein the computing device comprises a computer readable medium having computer executable components for controlling the movement system.

6. The medical device of claim 1, wherein the movement system comprises at least one internal sensor operationally coupled to the movement system for determining the position of the target.

7. The medical device of claim 6, wherein at least one internal sensor is coupled to a recorder that periodically records the position of the as the movement system moves the target.

8. The medical device of claim 1, wherein the movement system moves the target along a linear path between a first predetermined location spaced from the eye and a second predetermined location nearer the eye.

9. The medical device of claim 1, wherein the camera is coupled to a camera controller for controlling the capture of images of at least on eye.

10. The medical device of claim 9, wherein the camera controller comprises a computing device.

11. The medical device of claim 10, wherein the computing device comprises a computer readable medium having computer executable components for controlling the camera.

12. The medical device of claim 1, wherein the camera is coupled to a recorder for recording the images captured by the camera.

13. The medical device of claim 12, wherein the recorder comprises a computing device recording the images on a computer readable medium.

14. The medical device of claim 12, wherein the recorder comprising an electronic digital recorder storing information in digital format on a computer readable medium.

15. The medical device of claim 1, wherein the camera is coupled to a communication interface for communicating captured images to a computing device.

16. The medical device of claim 15, wherein the computing device receives images from the camera as the images are captured.

17. The medical device of claim 1, wherein the camera captures images of both eyes.

18. The medical device of claim 1, further comprising a headrest extending forwardly from the camera.

19. The medical device of claim 1, further comprising an eye illuminator assembly positioned relative to at least one eye to provide illumination to at least one eye.

20. The medical device of claim 19, wherein the eye illuminator assembly comprises a conduit extending toward at least one eye and supporting an eye illuminator light providing illumination to at least one eye.

21. The medical device of claim 20, wherein the eye illuminator assembly further comprising a light source at its proximal end that transmits light to the distal end of the conduit to illuminate at least one eye.

22. The medical device of claim 21, wherein the eye illuminator assembly comprises a fiber optic bundle within the flexible conduit to transmit light from the light source to the distal end of the flexible conduit for illuminating at least one eye.

23. The medical device of claim 1, wherein the movement system comprising:

a. a support rod supporting the target at the distal end of the support rod; and

b. a drive mechanism motor for supporting, extending, and retracting the support rod relative to at least one eye.

24. The medical device of claim 23, wherein the drive mechanism further comprises:

a. idler wheels and a drive wheel engaged with and supporting the support rod;

b. a motor drivingly connected to the drive wheel; and

c. a sensor operationally connected to at least one of the group including the drive wheel, motor, idler wheels, and support rod generating a signal indicating the position of the support rod relative to the control box.

25. The medical device of claim 24, wherein the target is lighted.

26. The medical device of claim 1, wherein the camera comprises an electronic digital camera that transmits images in an electronic digital format.

27. The medical device of claim 1, wherein the control box is attached to one end of an elongate support arm, and the other end of the support arm being mountable to a fixed location at the location where the medical device is to be used.

28. A system for capturing and analyzing eye movement in response to a moving target, comprising:

a camera;

a movement system;

a target;

a computing device comprising

a. a processing unit;

b. a camera communication interface for communicating with the camera wherein the camera communication interface is coupled to both the processing unit and the camera so that a plurality of images captured by the camera are transmitted to and received by the processing unit;

c. a movement system communication interface for communicating with the movement system coupled to both the processing unit and the movement system enabling the processing unit to send signals to the movement system; and

d. a storage medium coupled to the processing unit, the storage medium storing program code implemented by the processing unit for

1. controlling the movement system by sending signals to the movement system through the movement system communication interface and determining the position of the target coupled to the movement system at the time each image of the plurality is captured; and

2. analyzing the movement of at least one eye in response to the moving target by analyzing the plurality of images captured by the camera;

wherein the camera is focused on at least one eye and captures images while the movement system is moving the target; and

the movement system supports and moves the target positioned in front of at least one eye in response to signals sent by the processing unit.

29. The system of claim 28, wherein the position of the target attached to the movement system is determined as a function of the signals sent to the movement system that control the movement of the movement system.

30. The system of claim 28, further comprising at least one sensor coupled to the movement system for determining the position of the movement system.

31. The system of claim 30, further comprising a position communication interface coupled to at least one sensor and the processing unit for communicating the position of the movement system to the processing unit.

32. The system of claim 28, wherein the position of the target attached to the movement system is determined as a function of signals sent from the movement system to the processing unit.

33. The system of claim 28, wherein the storage medium further stores program code implemented by the processing unit for recording the position of the target.

34. The system of claim 28, wherein analyzing the plurality of images captured by the camera comprises:

a. determining a coordinate system wherein an origin of the coordinate system appears within each image of the plurality of images;

b. selecting each image from the plurality of images one at a time;

c. determining the location of the pupil of at least one eye in the selected image;

d. determining the center of the pupil of at least one eye in the selected image; and

e. determining the coordinates of the center of the pupil within the coordinate system relative to the origin;

35. The system of claim 28, wherein analyzing the plurality of images captured by the camera comprises plotting the coordinates of the center of the pupil for each image of the plurality of images.

36. The system of claim 28, wherein analyzing the plurality of images captured by the camera comprises plotting the coordinates of the center of the pupil for each image of the plurality of images against the position of the target when each image was captured.

37. A method for assisting in diagnosing, treating, and monitoring a patient with a malfunction of the central nervous system, comprising:

a. positioning a target in front of at least one eye of the patient;

b. positioning a camera to capture a series of images of at least one eye of the patient;

c. moving the target along a trajectory relative to at least one eye of the patient after the patient has focused at least one eye on the target;

d. capturing the series of images of at least one eye with the camera as the target moves;

e. determining the position of the target at the time each image is captured; and

f. analyzing the position of a pupil of at least one eye in each image of the series of images captured by the camera.

38. The method of claim 37, further comprising selecting the trajectory for the target to follow while in motion.

39. The method of claim 37, wherein the trajectory is linear.

40. The method of claim 37, wherein the target is positioned between the two eyes of the patient.

41. The method of claim 37, wherein the trajectory has start and end location and the start locations is farther from the patient than the end location.

42. The method of claim 37, wherein the trajectory comprises a start location that is the location of the target at the start of movement along the trajectory and moving the target along the trajectory comprises a start time at which the target begins to move and a speed at which the target moves along the trajectory and the position of the target at the time each image is captured is determined as a function of the trajectory, start location, speed, and start time.

43. The method of claim 37, wherein the position of the target at the time each image is captured is determined by a movement system that controls the movement of the target.

44. The method of claim 42, wherein the position of the target at the time each image is captured is recorded by a movement system that controls the movement of the target.

45. The method of claim 37, further comprising recording the position of the target at approximately the time each image is captured.

46. The method of claim 37, wherein analyzing the position of the pupil of at least one eye in each image of the series of images captured by the camera comprises:

f. determining a coordinate system wherein an origin of the coordinate system appears within each image of the series of images;

g. serially selecting each image from the series of images;

h. determining the location of the pupil of at least one eye in the selected image;

i. determining the center of the pupil of at least one eye in the selected image; and

j. determining the coordinates of the center of the pupil within the coordinate system relative to the origin;

47. The method of claim 46, wherein the coordinate system comprises an orthogonal X-axis and Y-axis.

48. The method of claim 47, wherein the coordinates of the center of the pupil comprise an X-value along the X-axis and Y-value along the Y-axis.

49. The method of claim 48, wherein analyzing the position of the pupil of at least one eye in each image of the series of images captured by the camera comprises plotting the X-value of the coordinates of the center of the pupil in each image within the series of images against the position of the target when the image was captured.

50. The method of claim 48, wherein analyzing the position of the pupil of at least one eye in each image of the series of images captured by the camera comprises plotting the Y-value of the coordinates of the center of the pupil in each image within the series of images against the position of the target when the image was captured.

51. The method of claim 47, wherein the coordinate system further comprises a Z-axis orthogonal to both the X-axis and Y-axis and passing through the origin.

52. The method of claim 51, wherein determining the position of the target at the time each image is captured comprises determining the coordinates of the target within the coordinate system relative to the origin so that the position of the target comprises a Z-value along the Z-axis on the coordinate system.

53. The method of claim 52, wherein analyzing the position of the pupil of at least one eye in each image of the series of images captured by the camera comprises plotting the X-value of the coordinates of the center of the pupil in each image within the series of images against the Z-value of the coordinates of the target when the image was captured.

54. The method of claim 52, wherein analyzing the position of the pupil of at least one eye in each image of the series of images captured by the camera comprises plotting the Y-value of the coordinates of the center of the pupil in each image within the series of images against the Z-value of the coordinates of the target when the image was captured.

55. The method of claim 46, further comprising recording the coordinates of the center of the pupil for each image of the series of images onto a readable medium.

56. The method of claim 46, further comprising analyzing the speed of movement of the pupil of at least one eye within the series of images captured by the camera.

57. The method of claim 56, wherein analyzing the speed of movement of the pupil of at least one eye within the series of images captured by the camera comprises:

a. selecting a first set of coordinates for the center the pupil of one eye within a first image;

b. selecting a second set of coordinates for the center of the same pupil within a successive image of the series of images;

c. determining a linear distance between the first set of coordinates and the second set of coordinates;

d. determining a time interval that elapsed between capturing the first and second images; and

e. calculating the speed of movement of the pupil of the eye as a function of the linear distance between the first set of coordinates and the second set of coordinates and the time interval that elapsed between capturing the first and second images.

58. The method of claim 57, wherein camera captures images at a predetermined capture rate and the time interval that elapsed between capturing the first and second images is determined as function of the capture rate.

59. A computer readable medium having computer executable components for analyzing eye motion in response to an external visual stimulus, the computer executable components comprising an eye movement analysis module for

a. identifying a pupil in each image of a series of images of at least one eye of a patient captured while observing the external visual stimulus;

b. determining a coordinate system having an origin common to all images in the series of images;

c. determining the coordinates of the center of the pupil within the coordinate system relative to the origin for each image of a series of images; and

d. calculating the distance of the external visual stimulus from the pupil for each image of a series of images.

60. The computer readable medium of claim 59, wherein the distance of the external visual stimulus from the pupil is calculated as a function of the coordinates of the external visual stimulus within the coordinate system relative to the origin.

61. The computer readable medium of claim 59, further comprising a movement system module for determining the position of the external visual stimulus relative to at least one eye.

62. The computer readable medium of claim 61, wherein the movement system module comprises computer executable components for communicating position information concerning the external visual stimulus to the eye movement analysis module and the eye movement analysis module calculates the distance of the external visual stimulus from the pupil for each image in the series of images as a function of position data information provided by the movement system module.

63. The computer readable medium of claim 61, wherein the movement system module determines the position of the external visual stimulus relative to at least one eye by having computer executable components for reading position data recorded on a computer readable medium.

64. The computer readable medium of claim 61, wherein the movement system module records the position of the external visual stimulus relative to at least one eye by having computer executable components for receiving position data from a movement system and computer executable components for recording the position data.

65. The computer readable medium of claim 61, wherein the movement system module comprises computer executable components for recording the position of the external visual stimulus relative to at least one eye.

66. The computer readable medium of claim 65, wherein the eye movement analysis module calculates the distance of the external visual stimulus from the pupil for each image in the series of images as a function of position data recorded by the movement system module.

67. The computer readable medium of claim 61, wherein the movement system module comprises computer executable components for recording the position of the external visual stimulus relative to at least one eye at the time each image captured.

68. The computer readable medium of claim 59 further comprising a camera module for controlling a camera used to capture the series of images.

69. The computer readable medium of claim 68, wherein the camera module comprises computer executable components for directing the camera to capture images.

70. The computer readable medium of claim 68, wherein the camera module comprises computer executable components for determining a capture rate at which the camera captures the images in the series of images.

71. The computer readable medium of claim 59 further comprising a recording module for recording the series of images captured by the camera.

72. The computer readable medium of claim 59, wherein the external visual stimulus traverses along a path of a predetermined length at a predetermined speed and the external visual stimulus begins to move along the path at a start time and the eye movement analysis module calculates the distance of the external visual stimulus from the pupil for each image in the series of images as a function of the predetermined length of the path, the speed, and the start time.

73. The computer readable medium of claim 59, wherein the eye movement analysis module comprises computer executable components for providing a report of the coordinates of the center of the pupil and the distance of the external visual stimulus from the pupil for each image of a series of images.

74. The computer readable medium of claim 59, wherein the eye movement analysis module comprises computer executable components for displaying the coordinates of the center of the pupil and the distance of the external visual stimulus from the pupil for each image of a series of images.