An accurate, high speed, low cost, helmet mounted eye position measurement instrument is required. Applied science laboratories (ASL) proposes to demonstrate the feasibility of a dual path, solid state light position detector scheme by building a laboratory bench top model. Two coordinates on the eye that move differentially with rotation will be measured. This will compensate for relative motion between the helmet and the eye, and will measure eye line-of-gaze. Existing ASL hardware will be used to process the row signals and to provide calibrated eye attitude data. A successful feasibility demonstration of the scheme will lead to low cost, light weight, high resolution, helmet mounted devices with the potential for response times of under 5 msec. A working helmet mounted system suitable for use or test will be built under a phase II program.