At-home visual acuity tests valid versus in-office testing
Measurements for three at-home self-administered visual acuity (VA) tests were within one line of Snellen acuity compared within-office VA measurements, according to a study published online March 31 in JAMA Ophthalmology.
Kellyn N. Bellsmith, M.D., from the Casey Eye Institute at the Oregon Health & Science University in Portland, and colleagues validated three at-home visual acuity tests (printed chart, mobile phone app, and website) compared with in-office visual acuity among eligible participants with VA of 20/200 or better, recruited from four ophthalmology clinics. Participants were randomly assigned to self-administer two of three at-home tests within three days before their clinic visit.
One hundred twenty-one participants completed the study. The researchers found that the mean in-office VA was 0.11 logMAR (Snellen equivalent, 20/25). The mean difference between the at-home and in-office VA was −0.07, −0.12, and −0.13 for the printed test, mobile phone app, and website, respectively. The Pearson correlation coefficient was 0.72, 0.58, and 0.64 for the printed test, mobile phone app, and website, respectively.
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