For testing at 40cm (16 in.) using our (catalog no. 914) Small Illuminated Cabinet
Measures 23 x 35.5 cm (9 x 14 in.)
Logarithmic Progression using ETDRS Chart 1 and ETDRS Chart 2.
Size increments = 0.1 LOG Units
Optotype: Sloan letters
Features notations for Letter Size, Decimal, Meters, Feet, and Diopters of Add
Letter sizes 8.0 M to .20 M and acuity from (20/400, 6/120 to 20/10, 6/3 equiv.)
Mask included for concealing bottom portion of the chart while using the top for testing
Near vision test uses the same format as ETDRS 2000 series charts. ETDRS format is calibrated for reliable, repetitive testing using equal difficulty and geometric progression. Vision test uses Sloan optotypes for equal difficulty from optotype to optotype and from line to line creating a uniform level of difficulty. This test features two different ETDRS style permutations for repetitive non memorized testing for both eyes.