DLP TM-based dichoptic vision test system

Russell L. Woods Henry L. Apfelbaum Eli Peli Schepens Eye Research Institute and Harvard Medical School 20 Staniford Street Boston, Massachusetts 02114 Abstract. It can be useful to present a different image to each of the two eyes while they cooperatively view the world. Such dichoptic presentation can occur in investigations of stereoscopic and binocular vision e.g., strabismus, amblyopia and vision rehabilitation in clinical and research settings. Various techniques have been used to construct dichoptic displays. The most common and most flexible modern technique uses liquid-crystal LC shutters. When used in combination with cathode ray tube CRT displays, there is often leakage of light from the image intended for one eye into the view of the other eye. Such interocular crosstalk is 14% even in our state of the art CRT-based dichoptic system. While such crosstalk may have minimal impact on stereo movie or video game experiences, it can defeat clinical and research investigations. We use micromirror digital light processing DLPTM technology to create a novel dichoptic visual display system with substantially lower interocular crosstalk 0.3%; remaining crosstalk comes from the LC shutters . The DLP system normally uses a color wheel to display color images. Our approach is to disable the color wheel, synchronize the display directly to the computer’s sync signal, allocate each of the three former color presentations to one or both eyes, and open and close the LC shutters in synchrony with those color events. © 2010 Society of Photo-Optical Instrumentation Engineers. DOI: 10.1117/1.3292015

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