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11 September 1989 Synthetic Wavefront Interferometry: Eye Motion Sensor For Clinical Use And HUD Systems
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A Synthetic WaveFront Interferometer (SWFI) technique has been developed that when utilized can provide simultaneous refraction, pachymetry and keratometry measurements from a single instrument. The corneal topography measurement is provided globally, i.e., as a continuous measurement over the entire corneal region. The technology involves the utilization of a distinct illumination wavelength that provides strong separable reflections from the epithelial, endothelial and retinal regions of the eye. Synthetic wavefronts are developed by the impingement of the blue spectral wavefront containing the phase information onto a single Ronchi grating (ruling) after reflection from the respective surfaces. Moire patterns (or, SWFI patterns) are produced when these wavefronts impinge on a second Ronchi grating. Computerized analysis of the patterns provide an image to track in a clinic, or upon use in a Heads Up Display (HUD) system. The system is not sensitive to mechanical shock, vibrations or misalignment. Thus, it is totally compatible with the above uses.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Larry S. Horwitz, William A. Haas, and John Householder "Synthetic Wavefront Interferometry: Eye Motion Sensor For Clinical Use And HUD Systems", Proc. SPIE 1066, Laser Surgery: Advanced Characterization, Therapeutics, and Systems, (11 September 1989);

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