1.74 SF semi-finished UC/HC/HMC ophthalmic lens

What’s the Difference Between 1.67 and 1.74 High-Index Lenses?

1.74 high-index lenses are up to 10% thinner than 1.67 high-index lenses. Both have a high index of refraction and can accommodate strong prescriptions, but 1.74 high-index lenses are for especially strong ones: +/-8.00 or higher.

What Are the Advantages of High-Index Lenses?

• They’re thinner, lighter, and less obtrusive within frames, unlike thicker lenses that may protrude outwards. Lower-index lenses can also magnify or shrink the appearance of your eyes, which is not as much of a risk with high-index lenses. .
• They’re versatile. High-index lenses can be single-vision, progressive, and even light-responsive. You can also opt for high-index lenses that filter blue light, and if you’re getting sunglasses, polarized high-index lenses are an option, too. No matter how you’d like to customize your prescription lenses, it’s a good bet that high-index lenses can play along.
• They fit most frames. Your choice of frames won’t be restricted by high-index lenses: Their thin profile enables them to work with many frame styles if you have a higher prescription. (We recommend choosing a frame that centers your eyes behind each lens to reduce the thickness of your lenses. The stronger your prescription, the more important this is! Bigger frames = thicker lenses, regardless of the refractive index.)
• They’re comfortable. High-index lenses won’t sit heavy on your nose and ears, and they’re at less risk of sliding down than thicker lenses.

What Are the Disadvantages of High-Index Lenses?

• They’re not as impact-resistant as other lenses. High-index lenses aren’t always the best choice for children or for someone playing high-contact sports, as they’re slightly more fragile than polycarbonate and other plastic lenses.
• They can cost more than other lenses. Due to their materials and manufacturing process, high-index lenses can add extra cost to your eyewear bill. Some sellers price high-index lenses at hundreds of dollars more than conventional lenses. At Warby Parker, ordering high-index lenses will add $50–$150 to your total.
• They’re more reflective than other lenses. High-index lenses are prone to reflecting light, which can be distracting in bright environments. This property may make it tougher to see and drive at night. An anti-reflective coating is therefore a must for high-index lenses—and all of ours come with this coating already applied.

Can You Have High-Index Lenses in Sunglasses?

Yes, sunglasses can have high-index lenses. High-index lenses can be polarized or have a mirrored coating, so you can style your prescription sunglasses to your heart’s content.

Are High-Index Lenses Worth It?

So: Should you get high index lenses? If their aesthetics appeal to you, high-index lenses are a great way to get the thinnest lenses for a high prescription. When compared to lenses with a lower index of refraction, their benefits outweigh the bump in cost for many wearers.

Interested? Check with your eye doctor or optician, and see if high-index lenses are right for you.