Which eyelid is normal? My eyes don't look the same, but I don't know which eye is normal. (photo)

You have bilateral upper eyelid ptosis.  The left is the more ptotic of the two upper eyelids.  However, the right side is also ptotic.  In a detailed consultation the I suspect one will find that ptosis surgery is needed on both upper eyelids.  Both eyebrows are being raised to compensate for the upper eyelid heaviness.  Just performing surgery on the heavier of the two eyelids, often causes the lest heavy eyelids to fall after surgery.  That is because once one of the eyelids is corrected surgical, there is less of a need for the muscles to strain to open both eyes.  The result is that when only one eyelid is surgically address, the other side tends to fall after surgery.  The solution is to anticipate this before surgery and perform bilateral ptosis repair.

Thanks for your question. While both eyes are variations of normal, I think what you are likely referring to as 'abnormal' is the extra fold of skin at the nasal side of your left eyelid. This is known as an epicanthal fold and if it bothers you it is relatively easily corrected during a blepharoplasty.