High Index 1.74 lenses are the thinnest, flattest, and most cosmetically appealing lens ever developed.
These ultra thin lenses are nearly 50% thinner than plastic and 5% thinner than 1.67 high index lenses, offering you the ultimate in technology and cosmetics. The thinner lens is much more flattering, reducing the distortion that high prescriptions cause when made with lower quality lenses.
Hi-index 1.74 lenses are perfect for:
High index lenses have a flatter curve than their lower-index counterparts for a reduced lens profile. A flatter curve, however, can cause off-axis blurred vision. To compensate, the 1.74 lens incorporates optical aspheric technology into the lens design. Not all aspherics are created equal. FramesDirect.com uses Essilor lenses, known in the industry for having the most advanced optical performance and flattest design for aesthetic appeal.
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Also see: Understanding Your Prescription | UV Protective Coating for Lenses | Lens Materials | Transitions Lenses | I have a strong prescription. What lenses do I need?