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Most point-scanning retinal imaging modalities use raster scan patterns, which can appear in the subject’s vision as a rapidly moving line and cause subject eye motion, resulting in motion artifacts that require a dedicated fixation target to mitigate. In our recent development of a spiral-scanning confocal scanning laser ophthalmoscope, we noticed that the spiral scan pattern is visible to the subject as a bullseye-like shape and hypothesized that it could function as a virtual fixation target. A pilot study confirms this hypothesis by showing that images acquired with spiral scan show less eye motion than images acquired with raster scan.
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Franklin Wei, Kristen Hagan, Claire Y. Li, Anthony N. Kuo, Joseph A. Izatt, Al-Hafeez Z. Dhalla, "Spiral scanning for improved fixation in confocal scanning laser ophthalmoscopy," Proc. SPIE PC12360, Ophthalmic Technologies XXXIII, PC123600X (17 March 2023); https://doi.org/10.1117/12.2649733