Saccadic motion sensing

• US 7,682,024 B2
• Filed: 03/13/2004
• Issued: 03/23/2010
• Est. Priority Date: 03/13/2003
• Status: Active Grant

• Current Assignee: Charles P. Plant, Craig A. Mckeown, Kenneth C. Humphries, William T. Denman
• Original Assignee: Charles P. Plant, Craig A. Mckeown, Kenneth C. Humphries, William T. Denman
• Inventors: Denman, William T., Humphries, Kenneth C., Plant, Charles P., McKeown, Craig A.
• Primary Examiner(s): Ben; Loha
• Application Number:
  US10/799,045
• Publication Number:
  US 20040181168A1
• Time in Patent Office: 2,201 Days
• Field of Search: 351/200, 351209-211, 351/216, 351/221, 606 2- 5, 606 10- 14, 606/18, 606/19, 600/558, 600/585, 382/117, 382/254
• US Class Current: 351/209
• CPC Class Codes: A61B 3/113 for determining or recording eye movement
• CPC Class Codes: A61B 5/16 Devices for psychotechnics using teaching or educational appliances G09B1/00 - G09B7/00; Testing reaction times ; Devices for evaluating the psychological state
• CPC Class Codes: A61B 5/163 by tracking eye movement, gaze, or pupil change
• CPC Class Codes: A61B 5/165 Evaluating the state of mind, e.g. depression, anxiety
• CPC Class Codes: A61B 5/4821 Determining level or depth of anaesthesia A61B5/1106 takes precedence
• CPC Class Codes: G06Q 30/0241 Advertisements

Abstract

A saccadic motion detector comprised an optical system that focuses light reflected or emitted from the subject'"'"'s eye onto an optical navigation chip, which connects to circuitry configured to convert analog light from the eye to digital representations motion of the eye, including saccadic eye movement.

Claims

1. A saccadic-motion detection device comprising an optical system for focusing light reflected and/or emitted from a subject'"'"'s eye directly onto an optical navigation chip, said optical navigation chip comprising a solid state semiconductor whereby the solid state semiconductor contains a photo sensitive imaging array which is configured for recording the focusing light reflected and/or emitted from the subject'"'"'s eye and for measuring saccadic eye movement.

2. The saccadic motion detection device of claim 1, wherein the optical navigation chip directly converts the incident light into digital representations of the movement or position of the eye, or both.

3. The saccadic-motion detection device of claim 1, wherein the optical navigation chip is configured to determine the rate of movement of the eye.

4. The saccadic-motion detection device of claim 1, wherein the optical navigation chip is configured to determine angular position, speed, and/or acceleration of the eye.

5. The saccadic-motion detection device of claim 4, wherein the optical navigation chip is configured to compare the value of position, speed, and/or acceleration with a table associating known or standard conditions to those values determined from the subject'"'"'s eye.

6. The saccadic-motion detection device of claim 4, wherein a condition of the eye can be reported among known conditions for normal or impaired conditions, due to at least one of intoxication, fatigue, dementia, delirium, psychosis, attention deficit, hyperactivity, depression, or mania.

7. The saccadic-motion detection device of claim 6, wherein the condition of intoxication can be determined that is caused by drugs, such as benzodiazepines, ethanol (alcohol), barbiturates, narcotics, narcotic mixtures, and amphetamines.

8. The saccadic-motion detection device of claim 1, wherein the optical navigation chip is configured with the capability to provide position or motion information at greater than 1200 times per second.

9. The saccadic-motion detection device of claim 1, wherein the optical navigation chip is configured with the capability to provide position or motion information at between about 1200 and about 6000 times per second.

10. The saccadic-motion detection device of claim 1, wherein a handheld mechanical frame is attached to the optical system and the optical navigation chip.

11. The saccadic-motion detection device of claim 1, wherein a source of light, said source of light being outside the visible spectrum for humans, is configured to be attached near the subject'"'"'s eye so that the reflected light is received by the optical system.

12. The saccadic-motion detection device of claim 1, wherein the optical navigation chip contains an array of charge coupled devices (CCDs).

13. The saccadic-motion detection device of claim 1, wherein a subject is a creatures capable of saccadic eye motion, which includes humans and other animals.

14. A system for detecting saccadic eye movement comprising a motion transducer and, an optical apparatus configured to focus light received from a subject'"'"'s eye directly onto the motion transducer, which then provides at least one indication of saccadic eye motion over a discrete interval of time.

15. The system of claim 14 further comprising a light source to illuminate the subject'"'"'s eye, and and a housing for supporting all components of the system for ready portability.