If you already have a pair of glasses that fit well, you can compare the dimensions with your current frame.
Just look inside the temple to find the dimensions of your frame, the three numbers printed would be respectively lens width - bridge width - temple length.
Dimensions of this pair (mm) are -
Frame shape: Round
Rim: Full Rim
Frame weight: 9.8g
Nose pad type: Low bridge fit
Feature: Asian fit size，retro style eyeglasses
1. Glasses should be worn with both hands: this can prevent the glasses from unnessesary damage. When not in use, the glasses should be stored in an appropriate case to protect them from contact with hard objects and daily wear.
2. The glasses should not be placed in high temperature, to avoid damage to the lenses.
3. The suggested lens wiping method - First rinse off the dust on the lens with clean, cold water, then wipe with the lens cloth in the same direction. If there are oil stains on the lens, you can dilute a neutral detergent to clean the lens, and then rinse it off with water.