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Proceedings Paper

Coaxial fundus camera for opthalmology
Author(s): Luciana de Matos; Guilherme Castro; Tiago Ortega; Jarbas C. Castro Neto
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Paper Abstract

A Fundus Camera for ophthalmology is a high definition device which needs to meet low light illumination of the human retina, high resolution in the retina and reflection free image1. Those constraints make its optical design very sophisticated, but the most difficult to comply with is the reflection free illumination and the final alignment due to the high number of non coaxial optical components in the system. Reflection of the illumination, both in the objective and at the cornea, mask image quality, and a poor alignment make the sophisticated optical design useless. In this work we developed a totally axial optical system for a non-midriatic Fundus Camera. The illumination is performed by a LED ring, coaxial with the optical system and composed of IR of visible LEDs. The illumination ring is projected by the objective lens in the cornea. The Objective, LED illuminator, CCD lens are coaxial making the final alignment easily to perform. The CCD + capture lens module is a CCTV camera with autofocus and Zoom built in, added to a 175 mm focal length doublet corrected for infinity, making the system easily operated and very compact.

Paper Details

Date Published: 3 September 2015
PDF: 5 pages
Proc. SPIE 9578, Current Developments in Lens Design and Optical Engineering XVI, 957813 (3 September 2015); doi: 10.1117/12.2190515
Show Author Affiliations
Luciana de Matos, Univ. de São Paulo (Brazil)
Guilherme Castro, Razek Equipamentos (Brazil)
Tiago Ortega, Univ. de São Paulo (Brazil)
Jarbas C. Castro Neto, Univ. de São Paulo (Brazil)
Opto Eletrônica (Brazil)

Published in SPIE Proceedings Vol. 9578:
Current Developments in Lens Design and Optical Engineering XVI
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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