The best value lens on the market. Made of a premium polymer that is clearer and causes less distortion and abberation than polycarbonate. It is shatter-proof and very scratch resistant. Aspheric design eliminates "barelling" effect of other lenses. Has a premium grade anti glare and anti scratch coating. This coating is oleophobic (repels oil) and hydrophobic (causes water to bead up and fall off.) This lens has a 6 month, no questions asked money-back guarantee. If you don't like it for any reason, want to change powers, scratch it... anything, I will replace it or refund your money. You will not be dissappointed.