Visual acuity is lower when tested at home rather than in the clinic – Consumer Health News
THURSDAY, August 25, 2022 (HealthDay News) — Visual acuity (VA) is better when tested in the clinic than at home, according to a research letter published online August 18 in JAMA Ophthalmology.
Michael D. Crossland, Ph.D., of University College London, and colleagues compared home and clinic VA using data from the next clinic visit after the home assessment (mean duration , 8.8 months) to determine if the differences are due to disease progression. The analysis included 79 adults (mean age, 55 years).
The researchers found that the average VA was 0.80 logMAR (Snellen equivalent 20/125) at home and 0.75 logMAR (Snellen equivalent 20/112) in the clinic. The mean difference between home and clinic testing was -0.056 logMAR, with no consistent change seen with vision level.
“We hypothesized that the lower home VA values found by ourselves and others could be due to differences in illumination levels, differences in glare or light adaptation, difficulties understanding the test, differences in motivation without a clinician present, or perhaps by some effect of being in their own home,” the authors write.
The Home Acuity Test was developed by two of the study’s authors.
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