| Lenses with a 1.74 index are the most costly in terms of pricing. They possess 100% UV protection and are over 50% thinner than CR-39 lenses. They are available with aspheric technology and have a hard coat to resist scratching. Also available is an anti-reflection coat to enhance night driving. They are not suitable for tinting yet are capable of a rimless mount, however not recommended. These lenses are the smallest and display an attractive cosmetic appearance with little magnification.
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