... ,Can Flex Or Hinge Super flex or hinge sunglasses or optical frameExcellent quality and offered at competitive price ... How to Use and Protect the Glasses 1,Please wear or put off the glasses with your both hands. ... the screw is loose in hinge,pease don't wear untill the screw be tightened. 3,Please clean ... ,Our key products are Optical frame.Reading glasses,Sunglasses,Clip-on glasses,Kids glasses,ect. 2,We ...