At-home visual acuity in children using a custom iPhone application compared with standardized in-office visual acuity testing.

Comparing at-home app-based with gold-standard visual acuity, in eyes 20/40 or better, 95% (143/151) and 93% (91/98) of the younger and older cohorts were within 2 lines, respectively (mean differences: younger = -0.03, older = -0.04; 95% limits-of-agreement half-width (LOA): younger = ±0.26, older = ±0.22).

Comparing in-office app-based visual acuity with gold-standard visual acuity, in eyes 20/40 or better, 98% (160/164) and 94% (99/105) of the younger and older cohorts were within 2 lines, respectively (mean differences: younger = -0.03, older = -0.03; LOA: younger = ±0.22; older = ±0.24).