20 ft: COH (9 Line) Chart SF25 With 2 layers of paper

With 2 layers of paper and 1 layer of poly film

internet safety and drug safety

mental health and leadership within the school settings

The bio-based

The soft padding is sure to enhance the patient comfort

20 ft: COH (9 Line) Chart SF25 With 2 layers of paper(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.