There is no deformation in the periphery of the inspected lens, that is, through the inspection of the stress meter(Strain Gauge), there is almost no strip or sheet-like smoke-like smoke-like pattern around the lens, which is the most ideal condition for fitting. But this is difficult to do in the assembly, especially in the assembly of the full frame, because it is necessary to prevent the stress from being too weak and the lens cutting edge to be too small. If the stress is too strong or the local is too strong, the shadows of the shape of dark clouds, smoke, etc. appear around the lens, which extend to the center of the lens in a radial shape with acute angles. If the deformation is severe, the effective optical zone in the center of the lens will directly affect the wearer's corrected vision.

Processing time
According your order list. we will supply delivery time .
Commonly is 5-7 work days after we confirm payment
Shipping time
By Express : 3-7 days . Door to door service
By Air : 3-7 days . (the goods arrival at your local air ports
By sea : 30-40 days (the goods arrival at your local sea ports )
PS : by air or by sea, if you need door to door service, please tell us . we will help you checking the extra door to door cost.
How many months warranty do you provide ?
one year
What should I do if the machine have question ?
For ensuring all the items are in good quality, we will test all products before the packages were sent out. Once the machine have some question, please don't worry. kindly send us some images of the situation , Video and machine series, and explain the question in where . we will supply solution to you deal soon.
What should I do if the spare parts is broken in Warranty ?
If in Warranty, some spare parts broken in the Use. kindly supply picture or video , and machine series number .
We will send the spare parts by express to you soon.. and we bear express cost .
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Spectacles Stress Meter Manufacturer New Strain Gauge Optical Equipment Medical Eyeglasses
