On the other hand, polycarbonate lenses (index 1.59) might be only 20% thinner than regular plastic lenses. These are the most common lens materials found in prescription lenses. Individuals with a relatively strong prescription may find high.
Lens Materials
High index plastic’s index ranges from 1.67 to 1.74, making it considerably thinner and more lightweight than trivex, especially in higher prescriptions.
Polycarbonate lenses were introduced sometime in the 1980s by the gentex corporation.
•1.67 high index lenses are much less costly compared to 1.74. At the same time, there is less need for high index, if you have a very low prescription. If you’re not a child and don’t have. Polycarbonate lenses rose to critical acclaim due to its durable, and additional properties.
High index has less visual distortion, probably better cosmetic appearance.
I have progressives in plastic, high index (1.67) and trivex. As for the other questions, longevity of the lenses is not a major concern as they are only needed for the next 3 months or so. Likewise, what does 1.67 index lenses mean? 1.74 high index lenses are thinner and lighter than 1.67 high index lenses.
You wil also find that most high index lenses will be aspheric, my personal preference is for high index.
1.60 high index lenses are on average 20% thinner than ordinary cr39 plastic. •though both reduce the eye distortion caused by strong prescriptions (making your eyes look bigger or smaller than they are), 1.74 high index lenses accomplish this better than 1.67 high index lenses do. Trivex is not as thin as high index but. As to thickness it would depend on individual application and design of asphericity.
The trivex are my favorites, due to optics/general indestructibility.
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). As chip mentioned poly has a high amount of chormatic abberation. Our polycarbonate lenses have a 1.59 index which, while quite thin, is more focused on durability than lightness. Polycarbonate lenses have an index of refraction of 1.59, and will generally be about 20% thinner than standard plastic lenses.
1.67 high index lenses are better for those looking to save money or those who do not have extremely high prescriptions.
High index is thinner compared to other lenses but they don't have better optics. Polycarbonate lenses get a lot of press because they’re great for several specific uses, but let’s not discount the value of sleek, slender, and clear 1.67’s. This example shows the difference in thickness for high index lenses. 1.67 high index lenses are on average 35% thinner than ordinary cr39 plastic.
This is important to patients with high prescriptions, as their glasses can.
Affordability was not an issue, there was only a $10 difference between the 1.59 polycarbonate and 1.61 high index. Polycarbonate lenses if you are looking for thinner, lighter lenses that are comfortable, high index is the way to go. Zenni, as example, sells very high index lenses (1.74) for about 80 usd upgrade cost. Plastics are graded in numbers, such as 1.50 or 1.67.
Our 1.6, 1.67, and 1.74 index lenses can all be considered high index.
The general range of refraction is around 1.53 to 1.74. Actually, i think trivex has better optics than high index. However, it’s important to note that this blog post concerns itself primarily with lens thickness rather. Both 1.67 and 1.74 high index lenses can reduce the eye distortion caused by strong prescriptions, 1.74 high index lenses perform better than the 1.67 high index lenses.
Do i need high index lenses?
The higher the number, the thinner the lens. The higher the index of refraction, the thinner your lenses will be. High index plastic tends to have a greater visual clarity and, of course, a thinner profile than polycarbonate which only has a 1.59 index. Polycarbonate lenses also provide you with protection from 100% of the harmful uv rays from the sun.
When the refractive index is 1.7 or more, the lens is usually about 50% thinner than it’s glass or.
The previous material worn was contact lenses. This new eyeglass lens material had a high index of refraction, making it to be the lightest and thinnest lens material available then. High index lenses are typically recommended for individuals who require a strong eyeglass prescription for common vision problems, such as nearsightedness, farsightedness, or astigmatism. High index lenses thickness comparison:
The optician recommended zeiss premium progressive high index lenses (1.67 index) for the best optics.
Check out the chart below for the pros and cons of high index lenses vs. Trivex has a low index of 1.53, similar to standard plastic. 1.67 high index the 1.67 high. •1.74 high index lenses are thinner and lighter than 1.67 high index lenses.
1.74 high index lenses are on average 50% thinner than ordinary cr39 plastic.
If you're trying to decide between 1.67 vs 1.74 high index lenses, here are the differences: 74 high index lenses are better.
