Hi primaus72,
OPT uses the ETDRS chart to measure the patients’ visual acuity at enrollment and their BCVA throughout the study.
Just have a look at how an ETDRS visual acuity chart is structured and you will instantaneously understand why it says „5 letters = 1 line“.
Hi primaus72,OPT uses the ETDRS chart to measure the patients’...
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