Specifications
Range of diopter measurement: From 0D +/- 20D
Minimum scale value: 0.125D at 0D to +/- 5D to +/- 20D
Astigmatism axis of cylindric lens 0 to 180 degree: Minimum scale value 1 degree
Prism base angle: 0 to 180 degree, minimum scale value 5 degree
Regulation of ocular visibility: +/- 5D
Size of lens: 30mm to 90mm
Overall dimensions of device: 46x17x24 cm
Weight: 7.3 kg
Lighting lamp: 220V 25W / 110V 25W