FEB 05

1.67 High Index Lenses – A Light and Thin Choice

You may not yet be familiar with 1.67 high index lenses but they are something to learn about. There are plenty of reasons why these are the right choice for all types of lens wearers and here are just a few.

High index lenses are explained by their refractive index. The higher the refractive index, the more efficiently light is bent. For example, Polycarbonate lenses have a 1.58 refraction and Plastic CR-39 lenses refract at a rate of 1.498. Anything higher than these refractive rates are considered high index lenses. 1.67 high index lenses are considered one of the most popular choices in lenses and are 50% thinner than the CR-39 Plastic lenses.

In the past, when you got your prescription at the ophthalmologist, if you had a strong prescription it probably wasn’t a pleasant experience. The glasses were typically thick and extremely noticeable. These glasses were known as “Coke Bottle” glasses and created a bug-eyed look that was unattractive and noticeable.

These lenses also offer full UV protection, which is another added benefit. One thing to remember is that the higher your prescription, the higher index of lenses you need. For instance, a rule of thumb is that prescriptions over -6.00 diopters are perfect for high index lenses, and more specifically, the 1.67 high index lenses.

There are of course, recommended ranges in the prescription when making a choice for 1.67 high index lenses. Your doctor can help you make that determination but the average is a sphere power below + or – 2.50 and a cylinder power below + or – 2.50 and of course, the aforementioned -6.00 diopters.


Since these high index lenses are lightweight, they are more comfortable to wear. These glasses won’t feel heavy on your face or feel weighted down and uncomfortable. They are not only thinner but have lighter edges and use fewer materials than with traditional lenses. Now, you will find that the glass used is heavier than plastic lenses but the 1.67 high index lenses are still a light and thin choice.


The difference is in how these lenses are created. Old or traditional eyeglasses were heavy and thick because they needed to bend light efficiently but thanks to technology, chemists created a plastic that does the same thing. This plastic not only bends light more efficiently, meaning you get even better vision, but it uses fewer materials so that the lenses are much thinner and more lightweight.Zeiss 1.74 High Index Lenses: What's the Difference?

Perfect for Farsightedness

While you can typically choose high index lenses for any prescription, they are an extra benefit for those who have farsightedness. This is because they are less heavy and do not create that “Coke Bottle” look that traditional lenses do, especially in the prescriptions that are very strong.

Plenty of Choices

Another benefit is that the 1.67 high index lenses offer choices in styles that pair up nicely with your frames. This lens is slim and discreet and works well with rimless frames in particular. Look at it this way, you will focus on how your actual frames look instead of worrying about how thick your glasses are. This frees up the stress of feeling awkward or unattractive with thick glasses and allows you to pick your favorite frames.


If you’re looking for style, you won’t go wrong with these high index lenses because they’re non-obtrusive and won’t make you look like you have a strong prescription. In fact, no one will even notice the strength at all. Since they fit well with any frames, focusing on the look of your frames is the only thing you have to worry about.

While you have to make your own decision (with your doctor’s help) on which lenses to choose, you can’t go wrong with 1.67 high index lenses.

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