My eyes have recently changed shape. They are now noticeably different in size. What can I do? (Photo)

I've noticed only very recently (past couple of months) that the shapes of my eyes are very different. looking back at old photos I can see that both my eyes were about the same size. Now, however, the size difference is a very noticeable and it seems to be getting worse. What can the reason be and what can I do? (The size difference is noticeable even after I remove my makeup.)