Why does one of my eyes look different than the other? (Photo)

It has nothing to do with your astigmatism.Your issue is that your left upper eyelid is ptotic.  That makes your left eye look small.To repair this situation, ptosis surgery is performed.  This opens the droopy side.  There are a couple of types of ptosis surgery.  To get the best possible result, you need a through oculoplastic assessment to determine which ptosis surgery will be best for you.  Downtime for this outpatient surgery is about 10 days.  This is the point were most return to work.  Healing takes longer than this but by this time, the effects of surgery have calmed down enough that most people do not ask what you just had done.  These surgeries are performed under light intravenous sedation so no general anesthesia.I recommend getting several opinions before deciding on your surgeon.

Thank you for the question and sharing your photos. It appears that when you smile the eyelid closes more on the left side than the right. It would be helpful to see if the eye is smaller when you are not smiling. If the eyelid is normal when relaxed, then you have extra nerve stimulation to the eyelids of the left eye. This cannot be corrected. If the upper lid is droopy when not smiling, then it can be raised. You should have in office consultation with an Oculoplastic Surgeon to perform comprehensive evaluation and discuss potential treatment options. Good luck.