Range of power vertex.................... +15 D to -15D
Step of vertex power....................... 0 to (+/-) 10D for 0.125D: (+/-) 10D to (+/-) 15D for 0.25D
Range of cylindrical axis................. 0 - 180°
Step of cylindrical axis..................... 5°
Range of prismatic power............... 4 prism dioptre
Step of prismatic power.................. 1 prism dioptre
Max lens diameter............................. 80mm
Lighting lamp...................................... 220v/ 3w; 110v/3w
Eyepeice focusing............................. -5D to +5D
Voltage and power............................ AC 110v/ 60Hz; AC 220v/ 50Hz or 2 AA batteries
Weight.................................................. 360g