It appears that your palpebral fissure -- the amount to eye that you see between your eyelids -- is shorter on the left than on the right, and may be more noticeable when you smile. You have a mild ptosis of the left upper eyelid, which means it hangs down a bit more than the the right. Keep in mind that 85% of faces display some degree of asymmetry. That's an overwhelming majority. Look at my right eye on my profile page picture -- it's noticeably higher on my face and closed more than the left. You really only notice it if you're actively looking for it. It is likely that most people you know and meet don't notice your asymmetry.When a ptosis is secondary to a medical condition or prior therapy, a prescription eye drop can help even the eyes.Additionally, ptosis is correctable with surgery but a mild ptosis is difficult to correct to perfect symmetry and there are risks inherent to any surgery. If you want to proceed down that route, seek out a consultation with a Board-Certified Facial Plastic or Oculoplastic Surgeon who has experience with ptosis repair.Best wishes! Harry V. Wright MD, Sarasota, Florida