Effect of Luminance and Contrast Variation on Stereoacuity Measurements Using Smartphone Technology

Figure 4

The flowchart of test procedure. Test groups included 4 random-dot-based patterns (maximum brightness 240 lux, 120 lux, 60 lux, or 30 lux) and 4 contour-based patterns (maximum brightness 240 lux, 120 lux, 60 lux, or 30 lux). One group was selected randomly to test a participant. Two-step choices were conducted to measure the stereopsis threshold of 5% contrast, and then 10% contrast, and so on, until 95% contrast. Randomly, another group was chosen to do the examination again, and so on, until finishing all the 8 groups’ tests.