I need a set or two of new eyeglasses (1 for daily wear, 1 backup or tinted as sunglasses). I'm very near-sighted (-8 sphere) in both eyes. Which brand of lens should I get? Currently, I am wearing a pair of moderately expensive Guess frames with hi-index glass lenses (Nikon 2 or 3 I think). Last week, I broke my backup set of eyeglasses when I slipped at work...broke hi-index glass lens, causing a deep cut just beneath my left eye, resulting five or six stitches (feel pretty lucky that I didn't lose my eye). After that scare, I am seriously considering a set of high index plastic lenses. A local optician mentioned Nikon 5 for CDN$550 (US$350) for lenses only. Then add CDN$200 (US$130) for the frames. My employer covers CDN$250 (US$160) for eyewear every two years. Thanks for any advice. Dave PS. Until recently, I have sworn by glass due to it's thinness. Not any more. PS2. I may use my current Guess eyeglasses for backup....since my backup glasses are seldom used.