Why do frame glasses wear for a long time will be a little cross-eyed (that is, dark circles have cohesion), what method can be saved?
If a pair of glasses is worn for 8 years, it is difficult to change. I don't believe it should be. Normal optical shops can correct it, but you should take your time. When changing lenses, you can ask them to cut the pupillary distance slightly larger than this distance. After three months, change a pair of lenses and make them bigger until they are normal!