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Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) A Snellen chart is an eye chart that can be used to measure visual acuity . Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor ...
Sears is known for his views on vaccine scheduling. [3] He recommends that parents avoid or delay vaccinating their children, counter to the consensus recommendations of medical bodies, [6] and his book recommends that parents follow his two alternative vaccine schedules, rather than that of the American Academy of Pediatrics. [12]