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standard snellen eye chart
dimensions of a standard snellen eye chart
snellen eye chart uk
snellen scale eye chart
what is snellen eye chart
snellen eye chart explanation
snellen shape eye chart
the snellen eye chart measures
snellen eye examination chart
standard snellen eye chart, dimensions of a standard snellen eye chart, snellen eye chart uk, snellen scale eye chart, what is snellen eye chart, snellen eye chart explanation, snellen shape eye chart, the snellen eye chart measures, snellen eye examination chart
