Coaxial fundus camera for opthalmology

Luciana de Matos, Guilherme Castro, Tiago Ortega, Jarbas C. Castro Neto

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review


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.

Original languageEnglish
Title of host publicationCurrent Developments in Lens Design and Optical Engineering XVI
EditorsR. Barry Johnson, Virendra N. Mahajan, Simon Thibault
Place of PublicationBellingham, WA
Number of pages5
ISBN (Electronic)9781628417449
Publication statusPublished - 2015
Externally publishedYes
EventConference on Current Developments in Lens Design and Optical Engineering XVI - San Diego, United States
Duration: 10 Aug 201511 Aug 2015

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherConference on Current Developments in Lens Design and Optical Engineering XVI
CountryUnited States
CitySan Diego


  • Optical systems
  • Fundus cameras
  • Optical alignment
  • Reflex elimination
  • Retina Image

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