System for the physiological evaluation of brain function
The OculoKinetic Device is used to test an individual to evaluate brain functions and to identify the presence of a traumatic brain injury or disease which manifests itself through abnormal ocular responses to stimuli by using the high-speed tracking of an individual's eye movements, pupil size and reactivity, eye lid position and blink parameters and optionally along with other ocular elements, i.e., eyeball pressure, temperature, blood flow, etc. The eye movement stimulus protocol uses a target that moves in any direction of the two-dimensional plane and may use a color display or geometric shapes. In addition, the stimuli can be used in conjunction with cognitive testing, balance assessment, and other non-eye tests.
1. A method for computing a measure of the ocular response of a test subject using an ocular measurement device which is positioned in front of the eyes of the test subject, in response to predetermined visual stimuli which are presented on a stimulus presentation display that is positioned in front of the eyes of the test subject, for viewing by a test subject, comprising:
generating a visual stimulus for display to the test subject by the stimulus presentation display that moves in at least one of: a random pattern, discontinuous movement, and an oblique direction on the stimulus presentation display;
measuring, using the ocular measurement device, at least one of a temporal and one of a spatial eye movement of the test subject in tracking the visual stimulus displayed by the stimulus presentation device; and
computing a score representative of the measured ability of the test subject's eyes to track the visual stimulus, comprising:
retrieving baseline data, indicative of an individual's abilities to track the visual stimulus, from a normative database; and
determining a variance between the measured ability of the test subject's eyes to track the visual stimulus and the retrieved baseline data indicative of normative values of an individual's abilities to track the visual stimulus.
2. The method of computing a measure of the ocular response of a test subject of claim 1 wherein the step of measuring comprises:
calculating a speed of the test subject's eye in tracking movement of the visual stimulus.
3. The method of computing a measure of the ocular response of a test subject of claim 1 wherein the step of measuring comprises:
calculating the accuracy of the test subject's eye in tracking movement of the visual stimulus.
4. The method of computing a measure of the ocular response of a test subject of claim 1 wherein the step of measuring comprises:
calculating the overshoot/undershoot of the test subject's eye in tracking movement of the visual stimulus.
5. The method of computing a measure of the ocular response of a test subject of claim 1 wherein the visual stimuli are at least one of: geometric shapes, multi-color images, or flashing images.
6. The method of computing a measure of the ocular response of a test subject of claim 1 wherein the step of computing further comprises:
converting the determined variance in ability to track the visual stimulus into a scaled score.
7. The method of computing a measure of the ocular response of a test subject of claim 1 wherein the step of computing further comprises:
measuring at least one physiological characteristic of the test subject selected from the set of physiological characteristics including: pupillography, cognition, balance test results, cognitive test results, blood pressure, and body temperature; and
determining a variance between at least one physiological characteristic of the test subject and retrieved baseline data indicative of normative values of an individual's at least one physiological characteristic of the test subject.
8. The method of computing a measure of the ocular response of a test subject of claim 7 wherein the step of computing further comprises:
converting the determined variance in ability to track the visual stimulus combined with the determined variance in at least one physiological characteristic of the test subject into a scaled score.
9. The method of computing a measure of the ocular response of a test subject of claim 7 wherein the at least one physiological characteristic of the test subject comprises pupil size, pupil reaction to light stimulation, and hippus.
10. The method of computing a measure of the ocular response of a test subject of claim 7 wherein the at least one physiological characteristic of the test subject comprises blinks or ptosis.