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Black and white illustration of Snellen chart used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen, who developed the chart in 1862
Eye testSnellen eye test chart. View of a Snellen eye test chart used for measuring visual acuity. A patient stands a set distance (usually six metres) from the chart
View of a Snellen eye test chartSnellen eye test chart. View of a Snellen eye test chart used for measuring visual acuity. A patient stands a set distance (usually six metres) from the chart
Blurred view of a Snellen eye test chartSnellen eye test chart. Blurred view of a Snellen eye test chart used for measuring visual acuity. A patient stands a set distance (usually six metres) from the chart