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Application of an optimized low-cost spatial light modulator for efficient compensation of eye aberration patterns

In the last years, many efforts have been devoted to use electrically addressed spatial light modulators (SLMs) in Adaptative Optics. In this contribution we have optimized a low-cost SLM based on a liquid crystal (LC) device for the compensation of eye aberrations. This kind of devices is seldom used in ophtalmic applications due to the relatively low dynamic range of the phase retardation that can be introduced at each pixel. Here, we have optimized the phase modulation response of a commercial twisted nematic liquid crystal display (TNLCD) by means of a polarimetric arrangement that includes retarder plates and polarizers. Furthermore, we describe an efficient four-level phase encoding scheme that allows us to use these conventional SLMs for the compensation of optical aberrations as those typically found in human eyes. For obtaining experimental compensation results we have used artificial aberrated eyes simulated with refractive phase plates. This proof-of-concept is the first step to develop a low-cost real-time system for the correction of eye aberrations.