I am 62. 15 years ago I had a cosmetic upper eyelid surgery. I have noticed one lid drooping. My upper eyelid surgery will be a Mueller procedure, lifting the eyelid by shortening an eyelid structure named Mueller’s muscle. He will not do anything to the top external lids. The Dr said the stitches will be under the eyelid. Researching the procedure online, I didn't find much. Will the stitches interfere with my eyesight? What should I expect about discomfort? Thank you!