Validation of a Standardized Home Visual Acuity Test for Teleophthalmology.
Ophthalmol Sci
; 1(1): 100007, 2021 Mar.
Article
em En
| MEDLINE
| ID: mdl-36246005
ABSTRACT
Purpose:
The recent exponential growth in teleophthalmology has been limited in part by the lack of a validated method to measure visual acuity (VA) remotely. We investigated the validity of a self-administered Early Treatment Diabetic Retinopathy Study (ETDRS) home VA test. We hypothesized that a home VA test with a printout ETDRS chart is equivalent to a standard technician-administered VA test in clinic.Design:
Prospective cohort study.Participants:
Two hundred nine eyes from 108 patients who had a scheduled in-person outpatient ophthalmology clinic visit at an academic medical center.Methods:
Enrolled patients were sent a .pdf document consisting of instructions and a printout ETDRS vision chart calibrated for 5 feet. Patients completed the VA test at home before the in-person appointment, where their VA was measured by an ophthalmic technician using a standard ETDRS chart. Survey questions about the ease of testing and barriers to completion were administered. For the bioequivalence test with a 5% nominal level, the 2 1-sided tests procedure was used, and an equivalent 90% confidence interval (CI) was constructed and compared with the prespecified 7-letter equivalence margin. Main OutcomeMeasures:
The primary outcome was the mean adjusted letter score difference between the home and clinic tests. Secondary outcomes included the unadjusted letter difference, absolute letter difference, and survey question responses.Results:
The mean adjusted VA letter score difference was 4.1 letters (90% CI, 3.2-4.9 letters), well within the 7-letter equivalence margin. Average unadjusted VA scores in clinic were 3.9 letters (90% CI, 3.1-4.7 letters) more than scores at home. The absolute difference was 5.2 letters (90% CI, 4.6-5.9 letters). Ninety-eight percent of patients agreed that the home test was easy to perform.Conclusions:
An ETDRS VA test self-administered at home following a standardized protocol was equivalent to a standard technician-administered VA test in clinic in the examined population.
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Bases de dados:
MEDLINE
Tipo de estudo:
Guideline
/
Observational_studies
Idioma:
En
Revista:
Ophthalmol Sci
Ano de publicação:
2021
Tipo de documento:
Article