I can't imagine an IRB-approved research study that requires a software solution (developed under an NDA) to a hardware problem that couldn't be solved with a one-inch square of black electrical tape.
For the price of a contracted software developer, you could simply buy a model of laptop (or smart phone), in which the bezel can be pried open without substantial damage, and behind the LED's transparent aperture (but obscuring the LED), you fix a tidbit of black tape or whichever opaque material you may prefer.
Or, better yet, for pretty much every situation that doesn't involve eye-movement tracking, simply install a hidden security camera at an opportunistic vantage point.
I can't imagine an IRB-approved research study that requires a software solution (developed under an NDA) to a hardware problem that couldn't be solved with a one-inch square of black electrical tape.
For the price of a contracted software developer, you could simply buy a model of laptop (or smart phone), in which the bezel can be pried open without substantial damage, and behind the LED's transparent aperture (but obscuring the LED), you fix a tidbit of black tape or whichever opaque material you may prefer.
Or, better yet, for pretty much every situation that doesn't involve eye-movement tracking, simply install a hidden security camera at an opportunistic vantage point.