Is broken edge of lens poor quality?

There are eight reasons for the broken edge of half frame lens

In the daily operation, many businesses often encounter the cases that the half frame glasses are often complained by customers due to the phenomenon of broken edge. In order to reduce the complaints and complaints of customers, better meet the needs of customers, so that the sales staff can timely control the sales process, and reduce this phenomenon to the lowest point, I summarized several reasons for the collapse of half frame lens in the operation process, for reference of peers

1. The stress area of lens is small

2. Lens material and toughness

3. Improper use by the wearer

4. Improper placement, falling and hard object collision

5. The structure of the frame itself

6. The groove of lens is too deep

7. The drawing tension is too large

8. Inaccurate template making