Participants’ sociodemographics and cumulative grade point average (CGPA).

Participants’ sociodemographics and cumulative grade point average (CGPA).</p

Determination of % of times a VCDR of 0.53 judged to be larger than the standard photo’s VCDR (0.43), that is, when the test photo VCDR was larger by 0.1 unit.

Determination of % of times a VCDR of 0.53 judged to be larger than the standard photo’s VCDR (0.43), that is, when the test photo VCDR was larger by 0.1 unit.</p

S1 Data -

(XLSX)</p

The range of VCDR discrimination uncertainty was calculated by subtracting the VCDR that was accurately judged to be 25% <i>larger</i> than the standard photo’s VCDR with VCDR that was accurately judged to be 25% <i>smaller</i> than the standard photo’s VCDR.

The range of VCDR discrimination uncertainty was calculated by subtracting the VCDR that was accurately judged to be 25% larger than the standard photo’s VCDR with VCDR that was accurately judged to be 25% smaller than the standard photo’s VCDR.</p

The percent of test photo’s VCDR judged to be larger than standard photo’s VCDR, plotted as a function of VCDR.

The data was fit with a Weibull function. The point of subjective equality was determined by finding the VCDR that corresponds to ‘50% larger’ response.</p

An illustration of the optic nerve head (ONH) and the vertical cup-to-disc ratio (VCDR).

An illustration of the optic nerve head (ONH) and the vertical cup-to-disc ratio (VCDR).</p