What question did this study set out to answer?

To calibrate the SLO laser-beam raster for accurate measurement of angular distances and to assess distortion effects.

Distortion and Size Calibration of the Scanning Laser Ophthalmoscope (SLO) Laser‐Beam Raster

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Calibration method reveals trapezoidal distortion affecting retinal imaging, suggesting need for correction in SLO technology.

To calibrate the SLO laser-beam raster for accurate measurement of angular distances and to assess distortion effects.
Developed a calibration method and apparatus
Conducted repeated calibrations over a 3-month period
Analyzed shape and size stability of the laser-beam raster
Rasters are stable in shape and size but exhibit vertical trapezoidal distortion
Stimulus size can vary by up to 10% from top to bottom of the raster
Fixed horizontal retinal landmark measurements can also vary by up to 10%

Timberlake et al. (2003) studied this question.

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