This Sloan ETDRS Folding Chart is meant for 4 Meter Testing and can be hand-held or wall-mounted. It folds in half making it very convenient to transport.
The center segment of ETDRS Format Sloan Optotypes matches the optotype sequence of the ETDRS 2000 Revised Series Chart 1. The two islands on either side reduce memorization when testing OD, OS, and OU (Oculus Dexter, Oculus Sinister and Oculus Uterque).
Constructed with the same precision, accuracy, and methodology as traditional ETDRS charts. Lines are of equal difficulty. Geometric progression in letter size from line to line. Letter size is only variable.
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