Drooping of Upper Eyelid Due to Injury? (photo)

You may have suffered from an eye socket fracture (orbital fracture) which can cause the eye to sink back (enophthalmos) which can make the eye appear smaller. There could be other factors involved too which is difficult to assess by a 2D photo. It is best if you see an oculoplastic specialist for evaluation.

Your photo shows primarily brow asymmetry with your left brow positioned lower than the right.  Your left eyelid may or may not demonstrate ptosis (drooping).  An in-person physical exam would be able to sort this out.  High quality comparison photos from before your trauma would be useful in determining if the problem was related to the sports trauma.  A unilateral left browlift and possibly ptosis correction may be indicated.  Consult with experienced eyelid surgeons. 

What is apparent from the photo you posted is that your left eyebrow (right side of this photo) sits lower than the right eyebrow. It would be alot easier to assess this in person to see what a subtle lift of that eyebrow does for improving symmetry.  I would not recommend anything be done with your eyelids but you could consider either a Botox browlift or a surgical browlift to improve symmetry. I hope this information is helpful.