$30.75
Side One features ETDRS Format Chart 1 at 40cm testing distance.
Side Two features ETDRS Format Chart 2 at 60cm testing distance.
ETDRS Format – Logarithmic
No
Yes
8M to .2M
1.3 to -0.3
20/400 to 20/10
None
High
General/Literate
SLOAN
40cm / 16in
9×11 in
23×27.9 cm
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