Optometry Child Universal Trial Lens Frame Optician Test Tool 52-70mm
Features:
360 degree astigmatism axis position, error within one degree.
Lightweight and comfortable, weighing 22.2-22.6 G.
Flexible memory plastic, can bend 120 degrees.
Integrated soft silicone nose support, more comfortable to wear.
The use of aluminum magnesium alloy material, wear-resistant, not easy to deformation, the number does not fade
Material:
Aluminum Magnesium
Package Includes: 1xTrial Frame
1.Pupil distance range:50; 52; 54; 56; 58; 60; 62; 64; 66; 68; 70;72mm.
2.Axis scale:360° on the left; 360° on the right.The axis scale increases anticlockwise along the axis of the frame, and the marking interval is 5°.
3.Effective internal aperture of frame:Φ38mm.
4.The number of lenses that can be inserted into the left and right frames:3.
5.Rotation degree of optical axis of lens in inner ring of frame:360 °.
6.The nonparallelism between the optical axis of the lens and the geometric axis of the frame: ≤2.5
7.The difference between the optical center and the geometric center of the lens:≤0.5mm.
8.Displacement of the lens relative to the geometric center of the frame:≤0.3mm.
9.Adjustable length range of the left and right frame leg:125~155mm.
