20 ft: COH (9 Line) Chart Unavailable 34 Specula per Tube) For

34 Specula per Tube) For use with all diagnostic

This near vision card features calibrated Sloan optotypes in an ETDRS format

For each occurrence

ways to sop the behavior are presented

Fast ambient change ensures accurate reading in fluctuating ambient temperatures

20 ft: COH (9 Line) Chart Unavailable 34 Specula per Tube) For(9" x 14") Sloan optotype chart for vision testing at 20 feet. Features two smaller groups 20 25 to 20 12. 5 for repetitive eye testing. May be wall mounted or used with illuminated cabinets (66003, 66004, 66016, 66090). The Sloan optotypes were developed on the same basis as Snellen optotypes. Sloan optotypes do not use serifs however, but do use a logarithmic geometric progression.