Dear John, Unfortunately, what we all have to tell our patients is that nothing is without some risk! On my consents, I even have "death" noted as a risk because I can't tell anyone that there is zero chance of that. But the chance of death, double vision, or blindness in these types of cases in a healthy individual is very very low.
The chance of double vision occurs if there is damage to the eye muscles during surgery. Make sure that the surgeon you are working with is either an oculoplastic surgeon or someone with a lot of experience operating in this area. The chance of blindness comes generally from damage to the optic nerve (nearly impossible with eyelid procedures) or severe hemorrhage that may get trapped behind the eye and compress the optic nerve. If possible, your doctors will have you discontinue any blood thinners to minimize that risk (Of course if you are on blood thinners because of a history of heart disease or stroke, discontinuing those medications may increase your chance of those types of problems too, which should be carefully considered with your team of doctors.) Finally damage to the front of the eye can also cause loss of vision, but that is also rare. I use metal shields over the cornea to limit this problem.
All in all, there is risk in everything you do, including driving your car into the doctor's office for your exam. So as an individual, make sure you think the benefit that you think you will obtain from surgery outweighs the small risk you take.
Good luck!
Jasmine Mohadjer, MD