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ABO prep: ANSI, prep questions and answers
ABO prep: ANSI, prep questions 
 
ANSI tolerance for cyl power - +/- 0.09 to 0.37 
 
ANSI tolerance for ADD powers - +/- 0.12 to 0.18 
 
ANSI tolerance for vertical prism & OC location - 0.33 prism diopters total or 1.0mm 
 
ANSI tolerance for horizontal prism & OC location - 0.67 prism diopters total or +/- 2.5 mm from PD specified 
 
ANSI tolerance for sphere power plano to +/-6.00 - +/- 0.12 
 
ANSI tolerance for sph power 6.25 to 12.00 - +/-0.12 to 0.18 
 
ANSI tolerance for sph power above ...