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Summary of gold-standard measurements.
| Measurements | N | Mean (SD) | Range |
| MRD1a (mm) | 822 | 2.59 (1.21) | 0.00-6.00 |
| MRD2b (mm) | 822 | 5.51 (0.83) | 1.50-10.00 |
| LFc selected (mm) | 685d | 12.1 (2.12) | 3.50-18.00 |
aMRD1: marginal reflex distance 1.
bMRD2: marginal reflex distance 2.
cLF: levator muscle function.
dIn the LF model, 137 normalized eye photographs were excluded because the up- and down-gaze orbital photographs were not well merged.
