28 September 2016 Evaluation of retinal illumination in coaxial fundus camera
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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.
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André O. de Oliveira, André O. de Oliveira, Luciana de Matos, Luciana de Matos, Jarbas C. Castro Neto, Jarbas C. Castro Neto, "Evaluation of retinal illumination in coaxial fundus camera", Proc. SPIE 9947, Current Developments in Lens Design and Optical Engineering XVII, 994710 (28 September 2016); doi: 10.1117/12.2236973; https://doi.org/10.1117/12.2236973
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