According to the manufacturing process of the frame and workers who have worked in the eyeglasses factory for many years, in order to reduce the deformation of the frame, the left temple should be folded first and then the right temple. Note that the concept of left and right is defined by the wearer's perspective. The production and operation of the factory requires fine standardization to ensure the smooth operation of all links. Most eyewear retail stores follow the factory's standards to make the product placement look better.
As for my personal use, the frames are symmetrical, I don't care which eyeglasses leg is folded first. How about you?