... ,acetate optical frame,optical glasses , TR90 optical frames, pure titanium optical frames, eyewear glasses, optical lens, single vision lens, CR39 lens, progressive lens, free form , bi-focal lens photochromic lens, polarzied lens ... & Answers)1. What is sample cost & sample delivery time?Common sample: Free: Acetate/ Metal/ Titanium/ Plastic/ TR90/ Reading glasses/ Optical lens Non-free ...