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Proceedings Paper

Geometric approach to the design of an imaging probe to evaluate the iridocorneal angle structures
Author(s): Xun Jie Jeesmond Hong; Shinoj V. K.; V. M. Murukeshan; Baskaran M.; Tin Aung
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Paper Abstract

Photographic imaging methods allow the tracking of anatomical changes in the iridocorneal angle structures and the monitoring of treatment responses overtime. In this work, we aim to design an imaging probe to evaluate the iridocorneal angle structures using geometrical optics. We first perform an analytical analysis on light propagation from the anterior chamber of the eye to the exterior medium using Snell’s law. This is followed by adopting a strategy to achieve uniform near field irradiance, by simplifying the complex non-rotational symmetric irradiance distribution of LEDs tilted at an angle. The optimization is based on the geometric design considerations of an angled circular ring array of 4 LEDs (or a 2 × 2 square LED array). The design equation give insights on variable parameters such as the illumination angle of the LEDs, ring array radius, viewing angle of the LEDs, and the working distance. A micro color CCD video camera that has sufficient resolution to resolve the iridocorneal angle structures at the required working distance is then chosen. The proposed design aspects fulfil the safety requirements recommended by the International Commission on Non-ionizing Radiation Protection.

Paper Details

Date Published: 13 June 2017
PDF: 8 pages
Proc. SPIE 10449, Fifth International Conference on Optical and Photonics Engineering, 104490B (13 June 2017); doi: 10.1117/12.2269161
Show Author Affiliations
Xun Jie Jeesmond Hong, Nanyang Technological Univ. (Singapore)
Shinoj V. K., Nanyang Technological Univ. (Singapore)
V. M. Murukeshan, Nanyang Technological Univ. (Singapore)
Baskaran M., Singapore Eye Research Institute (Singapore)
Singapore National Eye Ctr. (Singapore)
Duke-NUS Medicine School (Singapore)
Tin Aung, Singapore Eye Research Institute (Singapore)
Singapore National Eye Ctr. (Singapore)
Duke-NUS Medicine School (Singapore)


Published in SPIE Proceedings Vol. 10449:
Fifth International Conference on Optical and Photonics Engineering
Anand Krishna Asundi, Editor(s)

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