When you’re ready to select your next pair of corrective glasses, it’s important to choose a lens that’s compatible with your prescription and frames. David Kind’s experience is designed to provide you with the knowledge necessary to ensure the best possible fit.
We combine our proprietary technology and provide access to expert opticians, so your prescription lenses can perform at their best. For glasses to work well, it is crucial that the measurements used to make them are accurate. Ideally, the frames should fit the unique shape of your face and also the distance between your eYes. At David Kind, we use proprietary technology to measure pupil distance, ocular center, and segment height. You can get more information about our measurement systemonline here.
Now that we’ve talked about the importance of frame fit and measurements, let’s talk about the actual materials of the lenses. To help you with your lens selection, we’ve provided this guide to help you select the right lens material for your next pair of glasses. 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 suitable for very light prescriptions (0.00 -/+ 2.00). CR39 lenses have been widely used since the material’s development in 1947. They were initially used commercially during World War II. CR39 lenses themselves are not UV protected and are prone to scratching. But normally protective coatings are applied to protect the wearer and the lens. This lens provides great optical clarity.
Trivex is a premium impact resistant, transparent material that is excellent for lighter prescriptions (0.00 to +/-3.50). In general, we recommend this material for the vast majority of prescriptions, as it provides better optical clarity than conventional polycarbonate. Trivex lenses also provide better 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 accommodate refractive errors. Ultimately, a high-index 1.67 material helps reduce lens edge thickness and weight for stronger prescriptions.
1.74 High Index
High index 1.74 lenses are excellent for prescriptions of +/-7.00 or stronger. As mentioned above, this material will help reduce lens rim thickness, weight, and is a compact lens reserved for only the strongest prescriptions.
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