High Index 1.74 lenses are the thinnest and lightest lenses that we carry at LensFactory. They are best for people with very strong prescriptions because they reduce both bulk and weight providing a modern look in your favorite frames. The trade-offs with High Index 1.74 lenses are they are more expensive than High Index 1.67 lenses, and are not suitable for photochromic upgrades, which transition your lenses from light to dark.
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