Spinning wave plate design for retinal birefringence scanning

Research output: Contribution to journalConference articlepeer-review

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 Müller-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.

Original languageEnglish (US)
Article number71691F
JournalProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume7169
DOIs
StatePublished - Jun 8 2009
EventAdvanced Biomedical and Clinical Diagnostic Systems VII - San Jose, CA, United States
Duration: Jan 25 2009Jan 26 2009

Keywords

  • Amblyopia
  • Eye fixation
  • Polarization optics
  • Retinal birefringence
  • Strabismus

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

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