Lens Materials: What’s Best for You 

When you’re ready to select your next pair of corrective eyewear, it’s important to pick a lens that is compatible with your prescription and frames. The David Kind experience is designed to provide you with the insights needed to ensure the best fit possible. 

We pair our patented technology and provide access to knowledgeable opticians, so your prescription lenses can perform at their best. For eyewear to function well, it is crucial that the measurements used to make them are accurate. Ideally, the frames should be tailored to your unique face shape and eye distance as well. At David Kind, we use patented technology to measure pupil distance, ocular center and segment height. You can learn more about our measurement system online here.

Now that we’ve talked about the importance of frame fit and measurements, let’s talk about the actual lens materials.  To help with your lens selection, we have provided this guide to help you select the right lens material for your next pair of eyeglasses.  At David Kind, we offer a variety of lens materials suitable for prescriptions: CR39, Trivex, 1.67 High Index and 1.74 High Index. 


This is a great basic material appropriate for very light prescriptions (0.00 -/+ 2.00). CR39 lenses have been widely used since the development of the material in 1947. Initially, commercially used during WWII. CR39 lenses themselves are not UV protected and are prone to scratches. But, protective coatings are usually applied to protect the wearer and the lens. This lens provides strong optical clarity.



Trivex is a premium impact resistant and crystal clear material that is excellent for lighter prescriptions (0.00 to +/-3.50). We generally recommend this material for the vast majority of prescriptions as it provides more optical clarity than conventional polycarbonate. Trivex lenses also provide improved contrast sensitivity and less glare at night.


1.67 High Index

This lens material is excellent for higher prescriptions (ranging from +/-3.75 to +/-6.75). High Index lenses bend light more efficiently and require less material to be used to accommodate for refractive errors. Ultimately, a 1.67 High Index material helps reduce lens edge thickness and weight for stronger prescriptions. 


1.74 High Index

1.74 High Index lenses are excellent for +/-7.00 prescriptions or stronger. As mentioned above, this material will help reduce lens edge thickness, weight and is a compact lens reserved for the strongest prescriptions only. 



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