256400 White Handled Fixation Cube: A LEA SYMBOLS® cube with a central LEA SYMBOLS® optotype calibrated to 20/40 (6/12) equivalent at 16” and an outer LEA SYMBOLS® optotype calibrated to 20/200 (6/60) equivalent when tested at 16″ (40 cm) on top of the cube. The LEA SYMBOLS® optotypes on the side of the cube are calibrated to 20/125 (6/38) equivalent at 16”.
Measurements: Each fixation cube measures 6″ (15.24 cm) in length.
The cubes themselves measure 0.06″ square.