Specifications & Operation Instructions:
Usages: It is suitable for spectacles shops,department of ophthalmology in hospitals,schools and enterprises to measure eyesight.
1、Range of PD adjustments:
PD of both eyes 48 ~ 80mm
Left or right PD 24 ~ 40mm
Minimum graduated value 1mm
2、Dividing disc axial graduation:
Left dividing disc 120° ~ 0 °~ 135°
Right dividing disc 45° ~ 180° ~ 60°
Axial graduation increases along the lens frame axis counter clockwise, and the graduated distance is 5°.
3、Inner diameter of lens frame: F38mm
4、Number of lens which can be inserted into left or right lens frame simultaneously:4 pieces
5、Degree of lens rotating around optical axis in the lens frame: 360°
6、Nonparallelism between lens´ optical axis and lens frame's geometric axis: ≤2.50
7、Non-concentricity between lens´ optical center and lens frame geometric center: ≤0.5mm
8、Displacement of lens in relation to position of lens frame geometric center: ≤0.3mm
9、Range of nose rest adjustment: Length:0 ~ 14mm; angle:0°~ 30°
10、Range of left or right lens frame leg´s length. adjustment: 115 ~ 150mm