You should know that it's a tough task to choose good sunglasses for some people who have a fat head, but there are still some tips which can help you make a good choice.
First, you should avoid small rounded eyeglasses frames. Because such frames are concentrated on the middle part of your face and they will make your chubby cheeks more visible.
Second, you can go for eyeglasses with rectangular frames that are not too thin or too thick. So next time, when you go to choose some sunglasses, you can have a good one by using these tips. But you should also pay attention to the color and the material.