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The review is dedicated to the visual acuity charts for assessment vision at far. The first part of the review provides definitions of basic terms: optotypes, step of the chart (change in the sign size from line to line), chart design; also, termination rules for measurement procedure and the main measuring units (logMAR, decimal units) are discussed. The second part of the paper provides historical review of charts development, starting from the beginning of the XIX century. The most widedoi:10.15690/vramn1142 fatcat:mz5kmk4jurdmjd3th3a23ncqty