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 language | English (US) |
|---|---|
| Article number | 71691F |
| Journal | Progress in Biomedical Optics and Imaging - Proceedings of SPIE |
| Volume | 7169 |
| DOIs | |
| State | Published - 2009 |
| Event | Advanced Biomedical and Clinical Diagnostic Systems VII - San Jose, CA, United States Duration: Jan 25 2009 → Jan 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