10 ft: Texas Prevent Blindness - NC (7 Line) Chart Unavailable Durable Design: Black vinyl upholstery

Durable Design: Black vinyl upholstery with built-in chart pocket

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10 ft: Texas Prevent Blindness - NC (7 Line) Chart Unavailable Durable Design: Black vinyl upholstery(9" x 14") May be wall mounted or used with illuminated cabinets (66003, 66004, 66016, 66090). These new charts are recommended by Prevent Blindness Texas and The Texas Health Department. 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.