The customer's discount prescription glasses degree belongs to the range of inventory pieces, and the advantage of inventory pieces is that the price is only half of the customized pieces! And the time block is directly processed from stock.

More importantly (easily overlooked), the center thickness of inventory pieces is thinner than that of customized pieces! This represents inventory pieces with only half the price, and ultimately their edge thickness is thinner than customized pieces of the same specification!

That is to say, to the same degree, regardless of the center thickness or edge thickness, customized sheets are thicker than inventory sheets. He is a discountglasses frame enthusiast and only likes thick frame and thick leg frame frames. The feedback mirror legs are stretched out and deformed, and cannot be adjusted back at all.

After summarizing the reasons, firstly, there is a common problem with the material of this type of board frame; Secondly, in the past, non-spherical inventory lenses were used, especially those with high refractive index and high degree. After the cheapest eyeglasses lenses were assembled, the mirror rings were already flattened, and due to stress reactions and other reasons, they only became flatter and flatter.

The customer's first requirement is that the frame cannot be stretched open and a base bend needs to be made. Therefore, the inventory of lenses is directly excluded, and only customized spherical lenses can be made. The customer is very concerned about the thickness of the edges and wants to wrap them as much as possible inside the mirror circle. Once a customized spherical surface with a base bend is chosen, the final edge thickness will be thicker than regular stock pieces!