Technical data:
　　Sphere: +16.75D~-19.00D (addition ±0.12D±10.00D )0.25D~3.00D
　　Cylinder: 0~-8.00D (addition -012D-2.00D)0.25D
　　Prism: 1△~20△(1 space=1△)
　　PD distance: 48mm ~80mm(1space=1mm)
　　Dimension: width405mm,height 320mm,thickness105mm
　　Weight: 8kg