Potec PLC-8000 - ETDRS Chart Function

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10. ETDRS Chart Function
 The instrument indicates the ETDRS chart where the visual acuity is changed in turn
from the upper column. While the ETDRS chart is indicated, press the ETDRS button
of the remote controller. Different ETDRS charts are indicated alternately.
ETDRS A ETDRS B
ETDRS C