ETDRS charts for Illuminator cabinet 4M ( 13 feet )

PV Number optotypes follow a Sloan standard.

PV Number optotypes follow a Sloan standard

Patients simply have to sign or gesture which direction they see the E facing.

Only standardized vision test accepted in studies sponsored by the National Eye Institute.

Designed for use in clinical studies and low vision evaluations where accurate, repeatable visual acuity measurements are required.

Can be wall-mounted.

Of all alternative vision tests, Tumbling E charts are one of the most accurate. Although Landolt C vision tests are considered the gold standard by many, Tumbling E charts are nearly equal. The Tumbling E uses just one optotype shown in 4 different positions. This makes testing easier because patients, who may not speak the same language or may not speak at all, simply have to gesture the direction they see each optotype facing.