More and more people need presbyopia glasses to see clearly in the near. And those who are farsighted, need to wear farsighted glasses to correct their vision. Whether they are presbyopes, farsighted glasses, or reading glasses, the lenses are essentially lenses with a diopter greater than 0.00D. (For ease of description, they are collectively referred to as presbyopic lenses below.)
Commonly available ready-made lenses for presbyopia are mostly 70-diameter and 65-diameter. When assembling, there may be some special reasons for dissatisfaction, such as the lenses may be too small to fit, the assembled lenses may look too thick, the weight difference between the left and right lenses may be too great, etc.
Theoretically, we cannot make the edges of the lenses too thin in order to have a solid fit and safe use. However, increasing the thickness of the edge also increases the thickness of the entire lens, making it …