Summary：
This product is suitable for eyesight inspection in spectacles shops, hospitals, ophthalmology, schools, factories and mines, enterprises, etc..
Detailed product description:
1, 50mm, 52mm, 54mm, 56mm, 58mm, 60mm, 62mm, 64mm, 66mm, 68mm,70mm,72mm twelve specifications;
2. Suitable for progressive wear test.
Parameter:
The default green, in addition to red and gray optional, as follows:
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