Mid index includes polycarbonate and Trivex. High index lenses are considered a lens material category of their own, though they are technically all made of different materials. If you’d like to know the difference between high index vs low index lenses, here’s what you should know: High index lenses are generally above 1.60 index, and low index lenses are generally below 1.50 index. 1.57 mid index single vision lenses means that the lens is thinner than standard plastic lenses. It is not the thinnest possible, nor is it impact resistant like Trivex 1.53 mid index lenses, or polycarbonate. It will be thinner than either of those materials. Single vision means that there is one range of vision. Basically the higher the index the thinner your lens will be which is also helping to provide better optics. Your prescription is not very high and the cyl is not of much concern either. I would say for a backup pair the lower cost 1.5 or 1.57 is just fine. The higher the index of refraction the thinner a lens can be to get the same refraction effect. Optical lenses are now classified into the following categories: Normal Index: 1.48-1.54; Mid Index: 1.54-1.64; High Index: 1.64-1.74; Ultra High Index: 1.74 and above. Abbe Value. Abbe value is a measure of the lens material’s dispersion of light. Mid Index 1.58 Xirm Xirm is a material with properties very similar to Trivex, thus making it a great choice for sports, youth, rimless and semi rimless frames. It has optical clarity far superior to polycarbonate, and is less expensive than Trivex, thus making it a top choice for impact resistant glasses. On the other hand, polycarbonate lenses have a higher index of refraction than Trivex lenses (1.58 vs. 1.53). Therefore, especially in high prescription powers, polycarbonate lenses will be noticeably thinner than Trivex lenses. Still, Trivex lenses are thinner than regular plastic eyeglass lenses, which have a refractive index of 1.50. The higher index of refraction means a denser material and therefore a thinner lens. Cosmetically, thin lenses appear more attractive but has more aberration. They also cost more. High index glass has more aberration than standard crown glass. Different manufacturers may have a different ABBE VALUE for the same exact lens.
Composite lenses incorporate polycarbonate, Trivex®, and other ophthalmic materials. Mid-index lenses are slimmer and lighter than standard plastic types.
The first step towards clearer vision is learning which lens index is right for you. Our chart explains lens indexes including 1,67 and 1.74 high index lenses. PPG named the material Trivex because of its three main properties which are good optics, light weight, and strength. Product Comparison. Index of Refraction. 11 Jul 2018 Trivex is even lighter and stronger than polycarbonate. You can also opt for Mid-Index Plastic and High-Index Plastic, which are progressively Contact us for the best prescription lenses to fit your lifestyle and budget! the Trivex lens gives you thin, lightweight mid-index optics in a durable plastic. 3 Jun 2017 It is a great mid index alternative for Rx ranges between +/-1.00D to +/-4.00D; also much cheaper than 1.53 Trivex and better optical Mid distance- If you mostly need these glasses for working on the computer or Lens index is a number that describes how thick or thin your lenses are.
Dispensing Trivex, The Decathlete of Lens Materials By Barry Santini It’s been just over a decade since PPG introduced Trivex, the lightweight, durable mid-index lens material that PPG positioned as an upgrade from its industry-standard CR-39 monomer.
For those reasons Trivex is the better choice in a mid-index lens. Trivex Lenses. Trivex is a relatively new optical lens material. It has the ultraviolet blocking properties (380 nanometers and less) and shatter resistant properties of polycarbonate. However, Trivex lenses have a much higher abbe value (43-45) vs. polycarbonate (abbe value 30 A mid index 1.57 is plenty in this -2.00 diopter scenario. Consider also that you will likely not wear those glasses for more than a few months, if you are working on vision improvement. Once you get close to -5.00 diopters, moving the index higher to a 1.61 is a good idea, if it fits your budget. High-index lenses are typically more expensive than standard plastic and mid-index varieties, but offer a wider choice of frames for people with stronger prescriptions, since the lenses are not bulky. Wearers benefit from a crisp, clear field of vision and comfort, even during prolonged use. A mid index 1.57 is plenty in this -2.00 diopter scenario. Consider also that you will likely not wear those glasses for more than a few months, if you are working on vision improvement. Once you get close to -5.00 diopters, moving the index higher to a 1.61 is a good idea, if it fits your budget. Mid index includes polycarbonate and Trivex. High index lenses are considered a lens material category of their own, though they are technically all made of different materials. If you’d like to know the difference between high index vs low index lenses, here’s what you should know: High index lenses are generally above 1.60 index, and low index lenses are generally below 1.50 index. 1.57 mid index single vision lenses means that the lens is thinner than standard plastic lenses. It is not the thinnest possible, nor is it impact resistant like Trivex 1.53 mid index lenses, or polycarbonate. It will be thinner than either of those materials. Single vision means that there is one range of vision.
Dispensing Trivex, The Decathlete of Lens Materials By Barry Santini It’s been just over a decade since PPG introduced Trivex, the lightweight, durable mid-index lens material that PPG positioned as an upgrade from its industry-standard CR-39 monomer.
a decade since PPG introduced Trivex, the lightweight, durable mid-index Trivex's unique combination of optical and performance characteristics makes a 107. 115. High-index 1.71–1.74. 135. 154. Trivex/Trilogy/TREXA. 48. 55. Phoenix . 48. 55. Polarized styles. Polarized plastic. 61. 71. Polarized mid- or high-index. A: First of all the refractive index have nothing to do with the impact resistance, it only The polycarbonate and trivex are the most resistant materials. a large minus (-) diopter, meaning the lens is thin in the middle and thick on the edge, The introduction of mid and high index lenses allowed for lenses to be made called CR-39 and has the added benefit of improved UV protection. Trivex Such lenses are called "high index" and stronger corrections are more attractive because they are slimmer. Trivex trivexTrivex lenses are impact resistant lenses and are a lightweight, durable mid-index lens material that is considered an The first step towards clearer vision is learning which lens index is right for you. Our chart explains lens indexes including 1,67 and 1.74 high index lenses.
2 May 2008 thickness of polycarbonate and 1.67 lens materials in many cases. It also provides In fact, lenses made using Trivex mid-index material, such.
PPG named the material Trivex because of its three main properties which are good optics, light weight, and strength. Product Comparison. Index of Refraction. 11 Jul 2018 Trivex is even lighter and stronger than polycarbonate. You can also opt for Mid-Index Plastic and High-Index Plastic, which are progressively Contact us for the best prescription lenses to fit your lifestyle and budget! the Trivex lens gives you thin, lightweight mid-index optics in a durable plastic. 3 Jun 2017 It is a great mid index alternative for Rx ranges between +/-1.00D to +/-4.00D; also much cheaper than 1.53 Trivex and better optical