How to measure your eyeglasses frame?

  When you want to get one suitable clip on sunglasses for prescription glasses. That's important to get measurement of your optical frame size .

Now let me tell you how to measure your optical frame as below

1.Firstly,you must be take one ruler 

2.Then find out the optical frames length .eyeglasses frame lens height,and nose bridge, I show you below frame size

Its acetate frame front length is 140mm,frame lens height is 39mm,Bridge size widthis 19MM

3.From our above picture acetate optical glasses, you learn your frame size .

If you want to get the polarized sunglasses clip on for you.

its size must be larger than frame length 140MM,Lens height larger than 39mm.nose bridge larger than 19mm.for example our polarized clip on size showed how to choose 

 that's easy to understand your optical frame size now