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.
We present a portable confocal scanning laser ophthalmoscope (cSLO) for high-resolution, widefield retinal imaging that uses a low-backreflection double-clad fiber for both illumination and collection to maintain robust alignment of confocal pinholes in a handheld form factor. The cSLO uses a new type of "hybrid spiral" scan pattern that is a hybridization of a constant angular velocity spiral with a constant linear velocity spiral. The hybrid spiral offers efficiency advantages over traditional raster scan patterns while serving as a natural fixation target. Feasibility of the system is demonstrated by imaging a human volunteer.
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