I had buried-suture double eyelid surgery on only one side. Once all the swelling went down, it became really similar to the side I didn’t have done. However, there is a difference in how defined it is. The line is a bit different when my eyes are closed too. Still, when my eyes are open, they look almost the same, and most people don’t really notice? After 1-2 years, the shape is okay, but the eye-opening strength is a bit different, so I’m considering surgery on the other side too..
The doctor isn’t friendly and seems to have their own strong opinions. Still, there are many reviews for one-sided double eyelid surgery, and after all the swelling went down, it seems they matched it well with the other eye, so I recommend it. If it’s double eyelid surgery on both eyes, I don’t think there’s any particular need to do it here.