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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 22 — Aug. 1, 2003
  • pp: 4621–4632

Compact scanning laser ophthalmoscope with high-speed retinal tracker

Daniel X. Hammer, R. Daniel Ferguson, John C. Magill, Michael A. White, Ann E. Elsner, and Robert H. Webb  »View Author Affiliations


Applied Optics, Vol. 42, Issue 22, pp. 4621-4632 (2003)
http://dx.doi.org/10.1364/AO.42.004621


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Abstract

The effectiveness of image stabilization with a retinal tracker in a multifunction, compact scanning laser ophthalmoscope (TSLO) was demonstrated in initial human subject tests. The retinal tracking system uses a confocal reflectometer with a closed-loop optical servo system to lock onto features in the fundus. The system is multifarious and modular to allow configuration for many research and clinical applications. Adult volunteers were tested without mydriasis to optimize the tracking instrumentation and to characterize imaging performance. The retinal tracking system achieves a bandwidth of greater than 1 kHz, which permits tracking at rates that greatly exceed the maximum rate of motion of the human eye. The TSLO system stabilized images to an accuracy of 0.05 deg in all test subjects during ordinary saccades with a velocity up to ∼500 deg/s. Feature lock was maintained for minutes despite subject eye blinking. Even when nearly 1000 frames were coadded, image blur was minimal. Successful frame coaddition allowed image acquisition with decreased noise in low-light applications. The retinal tracking system significantly enhances the imaging capabilities of the scanning laser ophthalmoscope.

© 2003 Optical Society of America

OCIS Codes
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.4470) Medical optics and biotechnology : Ophthalmology

History
Original Manuscript: February 4, 2003
Revised Manuscript: March 31, 2003
Published: August 1, 2003

Citation
Daniel X. Hammer, R. Daniel Ferguson, John C. Magill, Michael A. White, Ann E. Elsner, and Robert H. Webb, "Compact scanning laser ophthalmoscope with high-speed retinal tracker," Appl. Opt. 42, 4621-4632 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-22-4621


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