Fig 1.
An illustration of the optic nerve head (ONH) and the vertical cup-to-disc ratio (VCDR).
Fig 2.
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.
Fig 3.
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.
Fig 4.
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.
Table 1.
Participants’ sociodemographics and cumulative grade point average (CGPA).