Sphere -19.00D to +16.76D 0.25D +0.12D sphere inauxiliary dial included.
Cylinder Power 0.00D to 6.00 D 0.25D Plus or minus lens system optional.0.12 and 2.00D in accessory cells included.
Cylinder Axis 360º (Double 0º-180º scale) 5º
Cross cylinder ± 0.50 - -
Prism 0D to 20D 1D -
P.D. 48 mm to 75 mm 1 mm -
Vertex Distance 13.75 mm - Graduations extend range by 6 mm
Reading Distance (normal) 5" to 28" - Centimeter and diopter scales included.
Auxiliary Dial 10 lenses plus 2 open apertures - -