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Proceedings Paper

Evaluation of retinal illumination in coaxial fundus camera
Author(s): André O. de Oliveira; Luciana de Matos; Jarbas C. Castro Neto
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Paper Abstract

Retinal images are obtained by simultaneously illuminating and imaging the retina, which is achieved using a fundus camera. This device meets low light illumination of the fundus with high resolution and reflection free images. Although the current equipment presents a sophisticated solution, it is complex to align due to the high number of off-axis components. In this work, we substitute the complex illumination system by a ring of LEDs mounted coaxially to the imaging optical system, positioning it in the place of the holed mirror of the traditional optical design. We evaluated the impact of this substitution regarding to image quality (measured through the modulation transfer function) and illumination uniformity produced by this system on the retina. The results showed there is no change in image quality and no problem was detected concerning uniformity compared to the traditional equipment. Consequently, we avoided off-axis components, easing the alignment of the equipment without reducing both image quality and illumination uniformity.

Paper Details

Date Published: 28 September 2016
PDF: 7 pages
Proc. SPIE 9947, Current Developments in Lens Design and Optical Engineering XVII, 994710 (28 September 2016); doi: 10.1117/12.2236973
Show Author Affiliations
André O. de Oliveira, Opto Eletrônica S/A (Brazil)
Univ. de São Paulo (Brazil)
Luciana de Matos, Univ. de São Paulo (Brazil)
Jarbas C. Castro Neto, Opto Eletrônica S/A (Brazil)
Univ. de São Paulo (Brazil)

Published in SPIE Proceedings Vol. 9947:
Current Developments in Lens Design and Optical Engineering XVII
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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