Evaluation of Eye Movement Tracking Systems for Visual Rehabilitation

NCT ID: NCT00013429

Last Updated: 2009-01-21

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE2
• Total Enrollment: 100 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2000-01-31
• Study Completion Date: 2003-09-30

Brief Summary

The project objective is to validate the types of eye trackers that may most effectively be employed in the rehabilitation evaluation and training of people with central scotomas. The eye trackers will include the three basic types of eye trackers, namely, 1)electrophysical, 2) front surface trackers, and 3) retinal trackers.

Detailed Description

The project objective is to validate the types of eye trackers that may most effectively be employed in the rehabilitation evaluation and training of people with central scotomas. The eye trackers will include equipment representing the three basic types of eye trackers, namely, 1) electrophysical (e.g., electrooculogram or EOG), 2) front surface trackers (e.g. pupil), and 3) retinal trackers (e.g. SLO). The most appropriate eye tracking system for evaluation and training will depend on the type of eye movements (i.e., fixations, saccades, and pursuits) that comprise the complex eye movements used for visual skills (e.g., spotting, localization, scanning, tracing, tracking) which are being evaluated/trained for visually guided activities of daily living (e.g., reading, face recognition and television watching).

The following methods will be employed. First, a Scanning Laser Ophthalmoscope (SLO) will be employed to confirm that people with central scotomas are recruited from the Atlanta VA Eye Clinic and the VA Rehab R&D Subject Registry. SLO data taken for each eye will determine scotoma density, size and position. Visual functions of acuity, contrast sensitivity, and visual fields will be measured. Basic eye movements (e.g., fixation, tracking, saccades) and complex eye movements during visual tasks will be investigated to determine the effect of different biocular scotoma/PRL characteristics including: 1) central scotoma in one eye and functioning fovea in fellow eye, 2) central scotoma in both eyes and PRLs in retinal correspondence, and 3) central scotomas in both eyes with PRLs in anomalous retinal correspondence. Based on these biocular eye movement results, specifications can be developed for determining which eye can be used to monitor eye movements during binocular visual tasks (e.g., reading, face recognition, and TV event watching) as well as the need for biocular eye tracking equipment in evaluating complex eye movements. Each person will be tested using each representative eye tracker. The results of each eye tracker (position, velocity, and acceleration) in measuring PRL movements during fixation, saccade, and pursuit will be related to SLO measures. The results of these tests will also be compared to the types of measurements needed for evaluating complex eye movements in visual tasks. Specific measurements will be used to evaluate a patient's ability to perform the basic visual skills employed in performing everyday vision-related activities. The cost effectiveness of employing each type of eye tracker will be determined by a number of factors, including equipment cost, maintenance costs, ease of calibration and ease of use with low vision patients (e.g., feasibility for use with low vision patients who use head turns or optical low vision devices to view stimuli), and long-term reliability. Feasibility studies employing an eye tracker for eye movement monitoring during evaluations or biofeedback during training will be done in a few clinical studies (perimetry, PRL ability, visual scanning for reading training, and visual scanning for faces training) to indicate the potential clinical practicality of employing eye trackers for rehabilitative evaluation and training.

Conditions

Blindness

Study Design

• Allocation Method: NON_RANDOMIZED
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Interventions

Visual

Intervention Type: PROCEDURE

Eligibility Criteria

Inclusion Criteria

Visually impaired

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

US Department of Veterans Affairs

FED

Sponsor Role: lead

Principal Investigators

John Fryer, Ph.D., Asst. Director

Role:

Department of Veterans Affairs, Program Analysis and Review Section (PARS), Rehabilitation Research & Development Service

Nancy Rocheleau, Program Analyst

Role:

Department of Veterans Affairs, Program Analysis and Review Section (PARS), Rehabilitation Research & Development Service

Locations

VAMC, Decatur

Decatur, Georgia, United States

Countries

United States

Other Identifiers

C2102R

Identifier Type: -

Identifier Source: org_study_id