Colenbrander Mixed Contrast Card for Computer Distance 63cm (Front) and Intermediate Distance 100cm (Back). Choice of Letters or Numbers/Tumbling E’s on Front & Back – One Chart. Uses 10% calibrated Contrast Sensitivity level with Acuity. Designed by Dr. August Colenbrander. Conventional, high-contrast letter chart acuity captures only one aspect of visual performance. Low contrast acuity is equally important for activities of daily living, since most everyday objects have less than black-on-white contrast, are larger than the smallest letters seen on a letter chart and are seen at various intermediate distances. All tests provide HC targets on the left and LC targets (10% contrast) on the right. The left-hand margin indicates the letter size in M-units. Calibrated for use at 63 cm (25
