specifications︰ Range of PD adjustments:
PD of both eyes: 48 ~ 80mm
left or right PD: 24 ~ 40mm
Minimum graduated value: 1mm

Dividing disc axial graduation:
Left dividing disc:
120degree~0degree~135 degree
Right dividing disc:
45degree~180degree~60degree
Axial graduation increases along the lens frame axis counter clockwise,and the graduated distance is 50.

Inner diameter of lens frame:
32.5mm.

Number of lens which can be inserted into left or right lensframe simultaneously:
4 pieces

Degree of lens rotating around optical axis in the lens frame:
360 degree.

Nonparallelism between lens´optical axis and lens frame´s geometric axis:
≤2.5 degree.

Non-concentricity between lens´optical center and lens frame geometric center:
≤0.5mm.

Displacement of lens in relation to position of lens frame geometric center:
≤0.3mm.

Range of nose rest adjustment: Length:0 ~ 14mm;
angle:0 degree ~ 30 degree

Range of left or right lens frame leg´s length adjustment:
98 ~ 135mm.

Maximum interval between left and right lens frame legs:200mm.

Weight:70g

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