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Proceedings Paper

A novel automated instrument designed to determine photosensitivity thresholds (Conference Presentation)
Author(s): Mariela C. Aguilar; Alex Gonzalez; Cornelis Rowaan; Carolina De Freitas; Potyra R. Rosa; Karam Alawa; Byron L. Lam; Jean-Marie A. Parel

Paper Abstract

As there is no clinically available instrument to systematically and reliably determine the photosensitivity thresholds of patients with dry eyes, blepharospasms, migraines, traumatic brain injuries, and genetic disorders such as Achromatopsia, retinitis pigmentosa and other retinal dysfunctions, a computer-controlled optoelectronics system was designed. The BPEI Photosensitivity System provides a light stimuli emitted from a bi-cupola concave, 210 white LED array with varying intensity ranging from 1 to 32,000 lux. The system can either utilize a normal or an enhanced testing mode for subjects with low light tolerance. The automated instrument adjusts the intensity of each light stimulus. The subject is instructed to indicate discomfort by pressing a hand-held button. Reliability of the responses is tracked during the test. The photosensitivity threshold is then calculated after 10 response reversals. In a preliminary study, we demonstrated that subjects suffering from Achromatopsia experienced lower photosensitivity thresholds than normal subjects. Hence, the system can safely and reliably determine the photosensitivity thresholds of healthy and light sensitive subjects by detecting and quantifying the individual differences. Future studies will be performed with this system to determine the photosensitivity threshold differences between normal subjects and subjects suffering from other conditions that affect light sensitivity.

Paper Details

Date Published: 26 April 2016
PDF: 1 pages
Proc. SPIE 9693, Ophthalmic Technologies XXVI, 969311 (26 April 2016); doi: 10.1117/12.2218223
Show Author Affiliations
Mariela C. Aguilar, Bascom Palmer Eye Institute, Univ. of Miami (United States)
Alex Gonzalez, Bascom Palmer Eye Institute, Univ. of Miami (United States)
Cornelis Rowaan, Bascom Palmer Eye Institute, Univ. of Miami (United States)
Carolina De Freitas, Bascom Palmer Eye Institute, Univ. of Miami (United States)
Potyra R. Rosa, Bascom Palmer Eye Institute, Univ. of Miami (United States)
Karam Alawa, Bascom Palmer Eye Institute, Univ. of Miami (United States)
Byron L. Lam, Bascom Palmer Eye Institute, Univ. of Miami (United States)
Jean-Marie A. Parel, Bascom Palmer Eye Institute, Univ. of Miami (United States)


Published in SPIE Proceedings Vol. 9693:
Ophthalmic Technologies XXVI
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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