The risk of going blind as a result of cosmetic eyelid surgery is approximately one case in 30,000. Rare but definitely not zero. Upper eyelid surgery can result in vision threatening hemorrhage just as is associated with lower eyelid surgery.
Surgeons who perform cosmetic eyelid surgery under general anesthesia do so at a significant disadvantage to themselves and their patients. This is especially so for the upper eyelid because having the patient open and close the eyes during surgery created an opportunity to fine tune the surgery by assessing the effects of surgery in real time. Upper eyelid surgery can be very comfortably performed under local anesthesia or light intravenous sedation.
I noticed that a couple of respondents to this question state that you don't need eyelid surgery. The truth is that it is hard to precisely know why you need eyelid surgery without a personal consultation. Your photos suggest bilateral brow ptosis which will not be benefited by upper eyelid surgery. However, you also manifest subtle bilateral upper eyelid ptosis and this could be improved by a very precise anchor blepharoplasty. Please understand that this type of upper eyelid surgery must be performed under local anesthesia so that you can open and close the eyes during surgery.
I recommend that weight the small risk of having eyelid surgery before you decide if it is right for you. You should seek additional consultations and avoid eyelid surgery under general anesthesia.