Richmond Products Inc
Landolt C optotype charts are acknowledged as one of the most reliable pediatric acuity tests. Results are comparable to the original Snellen and many more, recently designed pediatric acuity optotype tests are measured against the Landolt C figures.
Richmond Products provides a family of four Landolt charts, offering a choice of near-point and distance versions. The distance Landolt C charts can be wall-mounted or used with various illuminated cabinet types.
For example, the new Landolt C chart (shown above) is used at 13 feet (4 meters) and is designed for use with any standard ETDRS cabinet or may be wall hung. ETDRS (Early Treatment Diabetic Retinopathy Study) is an important standard for acuity testing in drug trials, research or disease investigations. Optotypes on this chart are positioned in 14 proportionally spaced, geometric progression lines. Line sizes range from 20/200 to 20/12.5 (6/60 to 6/3.7) and are labeled for Snellen equivalents at 20 feet and 4 meters, Decimal, LogMar, actual size at 13 feet (4 meters) and letter size. Chart size is 24.5 x 25.5 inches (62w x 65 cm).