Specification:

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: 20MM to 80MM

7.Overall dimensions of device: 40.5*13*19.5 (CM)

8.Lighting lamp: 220V 3W/110V 3W

9.Weight: 4KGS