The ETDRS® Chart Set includes three standardized visual acuity testing charts designed in accordance with the Early Treatment Diabetic Retinopathy Study (ETDRS) protocol. Each chart features LogMAR-spaced lines, five optotypes per row, and standardized letter spacing to deliver accurate, repeatable visual acuity measurements across clinical practice, low vision care, and ophthalmic research.Rotating among the three charts helps reduce patient memorization of optotype sequences, supporting more reliable testing over multiple visits. The ETDRS® Chart Set is ideal for ophthalmology, optometry, clinical trials, and research environments where standardized testing is essential.
