Portable ETDRS chart offers advantages over standard chart

PHILADELPHIA — A pocket-sized ETDRS chart has the advantage of the high reproducibility of the standard ETDRS chart without the bulkiness, a speaker said here.While the Snellen chart is the most widely used eye chart, limitations apply, such as limited reproducibility, fluctuating background illumination, different number of letters on each line, and letters with different levels of difficulty to read.

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