Specifications:
1. Range of diopter measurement: from 0D to ±20D
2. Minimum scale value: 0.125D at 0D to ±5D, 0.25 at ±5D to ± 20D
3. Astigmatism axis of cylindric lens: 0 to 180°, minimum scale value 5°
4. Prism base angle: 0 to 180°, minimum scale value 5°
5. Regulation of ocular visibility: ±5D
6. Size of lens: 30MM to 90MM
7. Overall dimensions of device: 46*17*24 (CM)
8. Weight: 7.35KGS
9. Lighting lamp: 220V 25W/110V 25W
