Dear Aminath,

The majority of the eyewear products we sell are not one-size-fits-all and therefore you will need to select the correct size.

The easiest way to find your frame size is to check the size that is printed on the inside of your current frames. This is usually a good indication of the size you should buy.

- Check out the Virtual Try-on function on our website to virtually try on items from the comfort of your own home.
- The new Style finder will help you to find a frame that matches your personal style or you can use our guide to find a frame based on your personality!

Best Regards,
SmartBuyGlasses

I don't really know the standard size, but at their website they give you the measure of each part of the glasses with a picture of each. I already had a glasses so I read the internal part of the arm and a ruler and that's really close to the real perfect fit. If you don't have one, you can go to a store try the glasses that better fit to your face and copy the info they have at the arm. Hope that help.