Spinning wave plate design for retinal birefringence scanning

K. Irsch; B. I. Gramatikov; Y.-K. Wu; D. L. Guyton

doi:10.1117/12.803344

24 February 2009 Spinning wave plate design for retinal birefringence scanning

K. Irsch, B. I. Gramatikov, Y.-K. Wu, D. L. Guyton

Proceedings Volume 7169, Advanced Biomedical and Clinical Diagnostic Systems VII; 71691F (2009) https://doi.org/10.1117/12.803344
Event: SPIE BiOS, 2009, San Jose, California, United States

Abstract

To enhance foveal fixation detection while bypassing the deleterious effects of corneal birefringence in retinal birefringence scanning (RBS), we developed a new RBS design introducing a double-pass spinning half wave plate (HWP) and a fixed double-pass retarder into the optical system. Utilizing the measured corneal birefringence from a data set of 300 human eyes, an algorithm and a related computer program, based on Mueller-Stokes matrix calculus, were developed in MATLAB for optimizing the properties of both wave plates. Foveal fixation detection was optimized with the HWP spun 9/16 as fast as the circular scan, with the fixed retarder having a retardance of 45° and fast axis at 90°. With this new RBS design, a significant statistical improvement of 7.3 times in signal strength, i.e. FFT power, was achieved for the available data set compared with the previous RBS design. The computer-model-optimized RBS design has the potential not only for eye alignment screening, but also for remote fixation sensing and eye tracking applications.

Citation Download Citation

K. Irsch, B. I. Gramatikov, Y.-K. Wu, and D. L. Guyton "Spinning wave plate design for retinal birefringence scanning", Proc. SPIE 7169, Advanced Biomedical and Clinical Diagnostic Systems VII, 71691F (24 February 2009); https://doi.org/10.1117/12.803344

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