Just tell them you don't want the glasses. Tell them your case is not considered to be that bad. You only have a few more years of this then you'll likely never see 99% of these people for the rest of your life. At 16 it's been so long that you honestly should just commit at this point. We all tell stupid lies as kids but I think very rarely do they have this lifespan and you'd get a lot of shit for revealing it now. Not saying they wouldn't be friends with you anymore but as I'm sure you know kids your age can be dickheads.