If my optometrist recommends an eyelid lift, because it's beginning to interfere with my vision, will my ins. pay for it?

It is possible that your insurance will cover this procedure. You will need a formal visual field test, an evaluation by an eyelid surgeon as well as high quality photos of your eyelids. This will allow your surgeon to determine whether you are having vision issues due to the extra skin in your eyelids and your insurance company to determine whether surgery will be a covered benefit. I hope this information is helpful for you.Stephen Weber MD, FACSDenver Facial Plastic Surgeon

Loose skin of the upper eyelid can cause vision issues.  You will need a visual field test to determine to what degree this extra skin is disturbing your vision.  Your optometrist can perform this.  Take the results of this test to a plastic surgeon or a facial plastic surgeon during your consultation.  The office will submit your exam and the test results to see if YOUR insurance will cover the procedure

Just because they recommend surgery, it does not mean you need surgery and it certainly does not mean that your health insurance will pay for it.  Particularly in questionable situations (i.e. just beginning to interfere with vision) it is most likely going to be considered a cosmetic issue.  I recommend actually consulting an oculoplastic surgeon in your areas and leaning what they recommend.