Pupil distance adjustment range: the binocular pupil distance 48-80mm; the left or right pupil distance is 24~ 40mm; the minimum scale value is 1mm.
The dial axis position scale: the left indexing disk is 130°~0°~120°, the right indexing disk is 50°~180°~60°, the axial-position scale is increased in the counter clockwise direction along the axis of the frame, The scoring interval is 5°
Effective internal aperture of mirror frame: 33.5mm
When the left or right frame is used, the number of lenses can be inserted: 5 pieces (front 3 and back 2)
The degree of rotation of the lens in the inner ring of the frame about the optical axis is 360 °
Non-parallelism of the optical axis of the lens and the geometric axis of the frame: ≤2.5°
Different concentricity of the optical centre of the lens and the geometric centre: not less than 0.5mm
Displacement of the lens with respect to the position of the geometric centre of the frame: not less than 0.3mm
Nasal support adjustment range: adjustable length:0-25mm; angle: 360°
