What question did this study set out to answer?

The aim is to evaluate how pixel nonlinearity affects perceived gap widths in CRT-based visual acuity tests.

The Effect of Pixel Nonlinearity on Cathode‐Ray Tube–Based Visual Acuity Tests

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Evaluates how pixel nonlinearity affects visual acuity outcomes in CRT display tests, suggesting significant disparities based on gap orientation.

The aim is to evaluate how pixel nonlinearity affects perceived gap widths in CRT-based visual acuity tests.
Tested two high-quality color CRT monitors.
Used a square ring with white gaps to assess gap perception.
Measured acuity for horizontal and vertical gaps at distances of 8 to 11 m.
Conducted comparison studies with varying pixel values to equalize perceived gap widths.
Raster-parallel gaps seemed wider than raster-perpendicular gaps.
To match perceived widths, flanking luminance needed to be mid gray.
Left and right gaps produced 10% more correct responses than up and down gaps in some cases.
Acuity differences could not be explained by uncorrected astigmatism.

Liu et al. (2002) studied this question.

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Evaluates how pixel nonlinearity affects visual acuity outcomes in CRT display tests, suggesting significant disparities based on gap orientation.