Clinical investigation of a true color scanning laser ophthalmoscope

Ayyakkannu Manivannan, J. Van der Hoek, P. Vieira, Alison Farrow, Jim Olson, Peter Frederick Sharp, John Vincent Forrester

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Objective: To show true color scanning laser ophthal-moscope (SLO) images produced by simultaneously imaging the retina with red, green, and blue lasers.

Methods: Low-power red, green, and blue lasers were combined using fiber optics. By rapidly pulsing the lasers, each point on the fundus is illuminated by the 3 colors in quick succession, with the total power level being similar to that from a single laser. The reflected light is then decoded to extract the red, green, and blue color information and the true color fundus image is displayed live on a computer monitor.

Results: Comparison was made between the color SLO images from 5 patients and their digitized fundus photographs. The background fundus and retinal vasculature showed a similar appearance. The SLO gave better quality information in patients with ocular histoplasmosis, macular dystrophy, and optic disc drusen. By operating the color SLO in the indirect mode, macular edema could be dearly seen as lines and ridges surrounding the fovea.

Conclusion: The color SLO offers all the advantages of the present commercially available monochromatic device, with the added advantage of true color representation of the fundus without increasing either imaging time or the level of exposure.

Original languageEnglish
Pages (from-to)819-824
Number of pages5
JournalArchives of Ophthalmology
Issue number6
Publication statusPublished - Jun 2001




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