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Table 7 Technical specifications of prevalent computer screens and calculation of the minimum and maximum displayable aliased text size (logMAR) for a viewing distance of 40 cm

From: Introduction of a digital near-vision reading test for normal and low vision adults: development and validation

Screen specifications logMAR at 40 cm
Resolution Diagonal (inch) pixels size (cm) pixel size (mm) ppi Min Max
FHD 15.6 1920 × 1080 34.54 × 19.42 0.18 141.26 0.2 >  1.3
FHD 14 1920 × 1080 30.99 × 17.43 0.16 157.38 0.2 >  1.3
4 K 15.6 3840 × 2160 34.54 × 19.42 0.09 282.4 −0.1 >  1.3
4 K 14 3840 × 2160 30.99 × 17.43 0.081 314.7 < −0.1 >  1.3
4 K 13.3 3840 × 2160 29.44 × 16.56 0.08 331.3 < −0.1 >  1.3
2.5 K 10 2560 × 1440 22.14 × 12.45 0.09 293.78 −0.1 1.3
  1. FHD = full high definition; ppi = pixels per inch