Mid index lens vs polycarbonate
I then selected the mid-range 1.56 index (which is close to the 1.57 of Zenni's lenses) and compared the numbers to the polycarbonate lens, which should be a 1.59 index. While I don't really know what I'm doing - it looked like the difference was about 0.2mm - which to me seems like it wouldn't be worthwhile. Mid-Index Plastic. Benefits: Light, slim; compatible with most treatments. Mid-index lenses are slimmer and lighter than standard plastic types. A variety of protective treatments can also be applied, including photochromic and no-glare coatings. Slightly stronger prescriptions for farsightedness typically require a thicker lens. 1.59 Index - Polycarbonate Lens. Lenses in this index are made out of a special polycarbonate material. This means they include 100% UV protection. They're durable and impact-resistant, which also makes them perfect for everyone with most prescriptions. Active people and children as well. 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 with mid-index or hi-index lenses, but not polycarbonate / Trivex lenses. From what I read about polycarbonate lenses, their optical quality is not as good as CR-39 or glass. But Trivex has better abbe value than poly, in addition to having the same superior impact resistance. So my questions for those who have experieced both. What your take Other high-index materials are classified by numbers. The higher the number, the thinner and lighter the lens. The lower numbers are classified as mid-index lenses. Mid-index lenses, such as 1.54, 1.56, and 1.57, are thinner than glass, and nearly as strong as CR-39. Trivex is an improvement over Polycarbonate.
with mid-index or hi-index lenses, but not polycarbonate / Trivex lenses. From what I read about polycarbonate lenses, their optical quality is not as good as CR-39 or glass. But Trivex has better abbe value than poly, in addition to having the same superior impact resistance. So my questions for those who have experieced both. What your take
with mid-index or hi-index lenses, but not polycarbonate / Trivex lenses. From what I read about polycarbonate lenses, their optical quality is not as good as CR-39 or glass. But Trivex has better abbe value than poly, in addition to having the same superior impact resistance. So my questions for those who have experieced both. What your take Other high-index materials are classified by numbers. The higher the number, the thinner and lighter the lens. The lower numbers are classified as mid-index lenses. Mid-index lenses, such as 1.54, 1.56, and 1.57, are thinner than glass, and nearly as strong as CR-39. Trivex is an improvement over Polycarbonate. Chromatic aberrations are higher in polycarbonate lenses. The abbe value of polycarbonate is 30, the lowest of all lens materials making it the worst lens for optical clarity and integrity. Plenty of people cannot adapt to a polycarbonate lens. For those reasons Trivex is the better choice in a mid-index lens. 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
17 Sep 2019 The Type of Lens in Your Glasses Makes Difference Before we start looking at high index versus polycarbonate lenses, it is important to note
I then selected the mid-range 1.56 index (which is close to the 1.57 of Zenni's lenses) and compared the numbers to the polycarbonate lens, which should be a 1.59 index. While I don't really know what I'm doing - it looked like the difference was about 0.2mm - which to me seems like it wouldn't be worthwhile. Mid-Index Plastic. Benefits: Light, slim; compatible with most treatments. Mid-index lenses are slimmer and lighter than standard plastic types. A variety of protective treatments can also be applied, including photochromic and no-glare coatings. Slightly stronger prescriptions for farsightedness typically require a thicker lens. 1.59 Index - Polycarbonate Lens. Lenses in this index are made out of a special polycarbonate material. This means they include 100% UV protection. They're durable and impact-resistant, which also makes them perfect for everyone with most prescriptions. Active people and children as well. 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
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 characteristics than 1.59 Poly. Abbe, AR coatings and scratch resistance are decent. The only downside is availability with Trans and polarized.
17 Sep 2019 The Type of Lens in Your Glasses Makes Difference Before we start looking at high index versus polycarbonate lenses, it is important to note
Corning's high index glass lenses are available in a wide range of refractive indices range of high-index barium glasses is used for near-vision correction in multifocal lens segments. indices up to 1.56 are generally described as “mid index” and those including 1.59 Plastic materials (such as nylon, polycarbonate,…)
Other high-index materials are classified by numbers. The higher the number, the thinner and lighter the lens. The lower numbers are classified as mid-index lenses. Mid-index lenses, such as 1.54, 1.56, and 1.57, are thinner than glass, and nearly as strong as CR-39. Trivex is an improvement over Polycarbonate. Chromatic aberrations are higher in polycarbonate lenses. The abbe value of polycarbonate is 30, the lowest of all lens materials making it the worst lens for optical clarity and integrity. Plenty of people cannot adapt to a polycarbonate lens. For those reasons Trivex is the better choice in a mid-index lens. 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 lenses are used extensively for safety eyewear such as in your shooting glasses and has the most aberration. Keep in mind that most of us see just as well with a low ABBE VALUE lens as compared to a high ABBE VALUE lens. Crown glass is most commonly used for eyeglass lenses with an index of refraction of 1.523.
5 May 2010 The refractive index of a lens material indicates how much the Materials with an index between 1.53 and 1.57 are sometimes considered mid-index, while While its optical characteristics are less than ideal, polycarbonate, Polycarbonate eyeglass lenses are a type of high-index lens that are also scratch and impact resistant and protect your eyes from UV. This material is highly The features of the next progressive lenses, the 1.59 mid-index pure polycarbonate progressive lens, and the high-index 1.61 and 1.67 lenses, follow the same pattern as the single-vision lenses. The 1.59 progressive lens, which, like the Trivex lens, cannot be tinted (although it can be ordered as polarized, Since polycarbonate is 1.58 index, it is considered a “mid index” lens. Standard plastic lenses are around 1.48, so polycarbonate is a good, inexpensive alternative to standard plastic lenses if you do not have a very high prescription. But there is no such thing as high index polycarbonate lenses. Polycarbonate has a higher index of refraction than Trivex (1.58 vs. 1.53), so polycarbonate lenses are about 10 percent thinner than Trivex lenses. Weight. Trivex has a lower specific gravity than polycarbonate, making Trivex lenses about 10 percent lighter than polycarbonate lenses. with mid-index or hi-index lenses, but not polycarbonate / Trivex lenses. From what I read about polycarbonate lenses, their optical quality is not as good as CR-39 or glass. But Trivex has better abbe value than poly, in addition to having the same superior impact resistance. So my questions for those who have experieced both. What your take The higher the prescription, the higher index should be lens choices. Glasses tend to get quite thick at high correction, especially some low index (1.50) lenses. Also consider that polycarbonate is much more shatter resistant, tends to scratch less easily, and is much less prone to cracking (if you use frameless lenses, polycarbonate is a good idea).