One eye is bigger than the other? (photos)

There are many reasons your eyes could be slight different sizes, it is also normal to have asymmetrical features on your face. With that being said, botox can be placed to change the shape of the eye. I would recommend seeing an oculoplastic surgeon to evaluate you in person. Hope this helps.  

I think the problem may be the left side with left upper eyelid retraction or bulging eye but it could be from the right side. See video below and see an oculoplastic specialist for evaluation.