Multi-position eye movement detection system.

Abstract

A device that records saccadic eye movements in any X-Y position is presented in this paper. Eye movements are recorded using infrared optoelectronics mounted on hemispherical shaped eyepieces, which in turn are mounted on goggles styled after an ophthalmologist's test frames. A computer controlled, wall mounted light bank facilitates targeting for eye movements. Output from the device is sent to a PC type computer and stored in the hard disk using a data acquisition board. The user interface is Windows based and the output from the goggles are represented as a trace map of plotted points. This output can also be saved or printed for future analysis and reference. The device is designed with reference to standard ISO design methodology, and subject safety and final product usage have been reviewed following ISO analysis procedures. Accuracy in tracking of eye movements is maintained by utilizing a twenty-four channel detection system, hemispherically mounted and lensed optoelectronics to reduce cross-talk due to incident light, and signal processing that attenuates incident light as well as ambient light. Also, a reset feature is included to maintain equal baseline control. An automatic switching device is included in the test frame to allow the device to "warm up," assuring that equal IR power is delivered for each subject tested. The IR units in the goggles are also modular in case replacement is required.