These white plastic charts need to be front illuminated (not back illuminated) and comprise two panels each having 100% contrast on one side and 10% contrast on the other.

The acuity range covered is from 38 to 1.9 letter size. i.e. at 6m the chart covers from 6/38 to 6/1.9. Each chart is scored in Snellen (metric 6m, imperial 20 ft) as well as LogMar and VAR scale.

The recommended luminance for acuity testing is 160 cd/sq.m ( a tolerable range is 80 to 230 cd/sq.m).

Dimensions: 53 x 61 cm.