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Proceedings Paper

Retinal fundus imaging with a plenoptic sensor
Author(s): Brice Thurin; Edward Bloch; Sotiris Nousias; Sebastien Ourselin; Pearse Keane; Christos Bergeles
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Paper Abstract

Vitreoretinal surgery is moving towards 3D visualization of the surgical field. This require acquisition system capable of recording such 3D information. We propose a proof of concept imaging system based on a light-field camera where an array of micro-lenses is placed in front of a conventional sensor. With a single snapshot, a stack of images focused at different depth are produced on the fly, which provides enhanced depth perception for the surgeon. Difficulty in depth localization of features and frequent focus-change during surgery are making current vitreoretinal heads-up surgical imaging systems cumbersome to use. To improve the depth perception and eliminate the need to manually refocus on the instruments during the surgery, we designed and implemented a proof-of-concept ophthalmoscope equipped with a commercial light-field camera. The sensor of our camera is composed of an array of micro-lenses which are projecting an array of overlapped micro-images. We show that with a single light-field snapshot we can digitally refocus between the retina and a tool located in front of the retina or display an extended depth-of-field image where everything is in focus. The design and system performances of the plenoptic fundus camera are detailed. We will conclude by showing in vivo data recorded with our device.

Paper Details

Date Published: 19 February 2018
PDF: 13 pages
Proc. SPIE 10474, Ophthalmic Technologies XXVIII, 1047429 (19 February 2018); doi: 10.1117/12.2286448
Show Author Affiliations
Brice Thurin, Univ. College London (United Kingdom)
Edward Bloch, Univ. College London (United Kingdom)
Moorfields Eye Hospital (United Kingdom)
Sotiris Nousias, Univ. College London (United Kingdom)
Sebastien Ourselin, Univ. College London (United Kingdom)
Pearse Keane, Moorfields Eye Hospital (United Kingdom)
Moorfields Eye Hospital (United Kingdom)
Christos Bergeles, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 10474:
Ophthalmic Technologies XXVIII
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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