To find a frame of your size, you must first know the measurements of the frame that you require. In order to do that, please refer to the figure below and measure it accordingly:
If you wear glasses and have a pair handy already, first check the inner side of the temples (arms) of those glasses. Usually, there are some numbers listed on them.
For Example, it says: Brand Model 52/18 135 or 52 18-135, it refers to the following measurements. a) 52 – Lens Width b) 18 – Nose Bridge c) 135 – Temple size