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Proceedings Paper

Wide-field fundus imaging with trans-palpebral illumination
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Paper Abstract

In conventional fundus imaging devices, transpupillary illumination is used for illuminating the inside of the eye. In this method, the illumination light is directed into the posterior segment of the eye through the cornea and passes the pupillary area. As a result of sharing the pupillary area for the illumination beam and observation path, pupil dilation is typically necessary for wide-angle fundus examination, and the field of view is inherently limited. An alternative approach is to deliver light from the sclera. It is possible to image a wider retinal area with transcleral-illumination. However, the requirement of physical contact between the illumination probe and the sclera is a drawback of this method. We report here trans-palpebral illumination as a new method to deliver the light through the upper eyelid (palpebra). For this study, we used a 1.5 mm diameter fiber with a warm white LED light source. To illuminate the inside of the eye, the fiber illuminator was placed at the location corresponding to the pars plana region. A custom designed optical system was attached to a digital camera for retinal imaging. The optical system contained a 90 diopter ophthalmic lens and a 25 diopter relay lens. The ophthalmic lens collected light coming from the posterior of the eye and formed an aerial image between the ophthalmic and relay lenses. The aerial image was captured by the camera through the relay lens. An adequate illumination level was obtained to capture wide angle fundus images within ocular safety limits, defined by the ISO 15004-2: 2007 standard. This novel trans-palpebral illumination approach enables wide-angle fundus photography without eyeball contact and pupil dilation.

Paper Details

Date Published: 8 February 2017
PDF: 6 pages
Proc. SPIE 10045, Ophthalmic Technologies XXVII, 100451X (8 February 2017); doi: 10.1117/12.2252491
Show Author Affiliations
Devrim Toslak, Univ. of Illinois at Chicago (United States)
Antalya Training and Research Hospital (Turkey)
Damber Thapa, Univ. of Illinois at Chicago (United States)
Yanjun Chen, Univ. of Illinois at Chicago (United States)
Muhammet Kazim Erol, Antalya Training and Research Hospital (Turkey)
R. V. Paul Chan, Univ. of Illinois at Chicago (United States)
Xincheng Yao, Univ. of Illinois at Chicago (United States)

Published in SPIE Proceedings Vol. 10045:
Ophthalmic Technologies XXVII
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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