It is not absolute that low cost means poor quality. The quality is good or poor depends on many factors. The price of glasses not only been decided in the lens frame itself, as well as many other value-added. We look at the cost of an optical shop, if the higher the cost, and inevitably the higher of the price. But that does not mean that the quality of the glasses have a problem.When your are choosing glasses, the quality should be noted that these two questions: First, the top vertex (commonly known as degree) is qualified. Second, column axial deviation, the optical center of each level of difference, the optical center of the level of bias and the optical center vertical difference between each project eligibility.You should consider all the factors with the quality of glasses, the make a right choice.