All glasses are a compromise in some way, so you have to decide which flaws are most tolerable to you. -6 is strong enough correction that I'd seriously conside

All glasses are a compromise in some way, so you have to decide which flaws are most tolerable to you. -6 is strong enough correction that I'd seriously consider contact lenses if I needed it. Contact lenses avoid the image distortion and shrinkage you get with glasses, and because they move with your eyes, the image is sharp in all parts of your field of vision. Polycarbonate is IMO a terrible material for corrective lenses. It has very bad Abbe number, so you get a lot of chromatic aberration (rainbow artifacts) and it's very soft, so coating is pretty much required. Its only real virtue is impact resistance, which is important in safety glasses, but you can get flat safety glasses that fit over your corrective glasses. The weight is marginally better than CR-39, but not enough to make up for the poor optical performance. I haven't seen it person, but going by the numbers, Trivex seems superior. Wikipedia has some information on common materials: https://en.wikipedia.org/wiki/Corrective_lens#Lens_materials https://en.wikipedia.org/wiki/Corrective_lens#Lens_materials My preference for uncoated applies only to CR-39. Other materials have properties that make coatings more important. It's also possible that some coatings have much better resistance to cleaning than others. Unfortunately, details about coatings are generally secret, so there's no way to evaluate them.