The present disclosure relates generally to a system and method for detecting or indicating a state of impairment of a test subject or user due to drugs or alcohol, and more particularly to a method, system and application or software program configured to creating a virtual-reality (VR) environment that implements drug and alcohol impairment tests, and which utilizes eye tracking technology to detect or indicate impairment.

Optokinetic nystagmus (OKN) is an eye movement elicited by the tracking of moving objects in a visual field. It is characterized by an alternating smooth pursuit in one direction and saccadic movement in the other direction. The presence or absence of OKN indicates whether or not the moving stimulus was visible to the observer, without the explicit cooperation of the observer. It can be a tool for objective visual acuity assessment for patients such as young children who lack cognitive, attentional and language capabilities. Since the patient's head movement and unstable eye gaze may occur during the test, which often brings noises and irrelevant activities in the responses, making recognition of presence/absence of the OKN a challenging task. The present invention, using a dynamic velocity threshold (DVT) filter, provides a system and method for a quick and reliable OKN test and quantitative assessment of visual acuity.

A system or method for measuring human ocular performance can be implemented using an eye sensor, a head orientation sensor, and an electronic circuit. The device is configured for measuring vestibulo-ocular reflex, pupillometry, saccades, visual pursuit tracking, vergence, eyelid closure, dynamic visual acuity, retinal image stability, foveal fixation stability, focused position of the eyes or visual fixation of the eyes at any given moment and nystagmus. The eye sensor comprises a video camera that senses vertical movement and horizontal movement of at least one eye. The head orientation sensor senses pitch and yaw in the range of frequencies between 0.01 Hertz and 15 Hertz. The system is implemented as part of a faceguard.

A system and method for stimulus & eye tracking, useful for the determination of the presence or strength of optokinetic nystagmus (OKN) typically for assessing visual acuity, comprises providing a novel visual stimulus effective to elicit OKN, which includes varying the visibility of a visual stimulus element, or displaying a series of visual stimulus elements so that a later displayed element has different visibility relative to an earlier displayed element. Visual stimulus elements may vanish or appear by reducing or increasing intensity, contrast, size and/or width of the elements or element boundaries. Visual stimulus elements comprise a perimeter that is darker than a background and a centre that is lighter than the background, and/or a perimeter that is lighter than a background and a centre that is darker than the background.

A system and associated method for computerized rotational head impulse test (crHIT) to assess the semicircular canals of the human vestibular system clinically in patients with balance disorders. The system utilizes a rotary chair combined with a head mounted VOG system with head tracking sensors. The crHIT protocol uses the same physiologic principles as the known video head impulse test (vHIT). The crHIT utilizes whole-body rotation via the chair to yield a persistent controlled, repeatable, comfortable, reliable stimulus can be delivered while recording eye movements with video-oculogaphy.

A device for measuring eye movement in a human subject comprises a housing, at least one stimulator mounted to the housing, and a sensor. The at least one stimulator is configured to provide stimulus to one or both eyes of the subject. The sensor is configured to collect information related to movement of one or both eyes of the subject. The device also includes a user interface that is configured to control the at least one stimulator and display information collected by the camera.

A device for measuring eye movement in a human subject comprises a housing, at least one stimulator mounted to the housing, and a sensor. The at least one stimulator is configured to provide stimulus to one or both eyes of the subject. The sensor is configured to collect information related to movement of one or both eyes of the subject. The device also includes a user interface that is configured to control the at least one stimulator and display information collected by the camera.

The present invention relates to a technology for diagnosing dizziness by testing eye movement (motion), and more particularly, to a method and apparatus for diagnosing dizziness through eye movement measurement based on virtual reality capable of utilizing a commercialized virtual reality device to measure and test eye movement and transmit resultant data, measuring optokinetic nystagmus through movement of various gazing points (objects) generated in virtual reality, and diagnosing dizziness through the measurement, a recording medium storing a program for realizing the same, and a computer program stored in the recording medium.

A method of deception detection based upon ocular information of a subject provides a video camera configured to record a close-up view of a subject's eye. A cognitive state model is configured to determine a high to a low cognitive load experienced by the subject. An emotional state model is configured to determine a high to a low state of arousal experienced by the subject. After asking a question, the ocular information is processed to identify changes in ocular signals of the subject. The cognitive state and emotional state models are evaluated based solely on the changes in ocular signals where a probability of the subject being either truthful or deceptive is estimated for a binary output.

Disclosed is a system, method, and apparatus for quantification and feedback of eye deviations during normal viewing conditions. A sensory biofeedback system serves to emit a sensory cue such as a tone or vibration when a certain threshold of eye deviation has been exceeded. The biofeedback system allows objective monitoring of the accuracy of eye alignment that can be used outside of a clinical setting or inside a clinical setting.