Easily maintain interest and fixation with these Good-Lite Fixation Cubes. Available as either white handled with LEA Symbols only or red handle with easy recognizable pictures and LEA Symbols on top of cube. LEA Symbols fixation cube with white handle has a center LEA Symbol optotype calibrated to 20/40 (6/12) and an outer LEA Symbol optotype calibrated to 20/200 (6/60) equivalent when tested at 16″ (40cm) on top of cube. The LEA Symbols optotypes on side of cube are calibrated to 20/125 (6/38) equivalent.The LEA Symbols optotypes on side of cube are calibrated to 20/125 (6/38) equivalent. Fixation Cubes measure 6″ (15.24cm) in length.