Is surgery the only answer for external fistulas?

When my son is tired, one of his eyes turns outward.

My eyes felt relaxed. I didn't realize it usually.

On days when I feel tired and can't sleep, it starts from my eyes.

It looks like a markㅜㅜ I can't just leave it as it is.

I went to the hospital because of it, but the partition patch is temporary.

They say surgery is the only answer.ㅜ

Sometimes I hear that their eyesight improved after the patchㅜㅜ I wonder if it's notㅜㅜ I'm curious.