Hi Index Vs Polycarbonate

The opportunity to conform moderately under load without risking the integrity of the device is another important feature that distinguishes it from other interpositional devices. DURABIO™ by Mitsubishi Chemical Corporation – This is a bio-based engineering plastic made from plant-derived isosorbide monomer. Its transparency and optical homogeneity surpass those of BPA based conventional polycarbonate resin. Polycarbonate plastic is a perfect material for baby bottles, refillable water bottles, sippy cups, and several other food and beverage containers. Although safety of PC came under scrutiny as it is made with bisphenol A .

The weight of high-index lenses depends on a factor called the precise gravity of the lens material. 1.74 index lenses are up to 50% thinner than CR-39, 30% thinner than polycarbonate and 10% thinner than 1.67. When paired with an excellent AR your patient could have a great looking and clear couple of lenses. Abbe value is really a measure of the lens material’s dispersion of light. A lens with a low Abbe value causes a higher dispersion and leads to unwanted chromatic aberration. Chromatic aberration is a distortion of the image because of the inability of the lens to focus all colors onto the same focal point. This leads to the perception of undesirable color fringes when viewing objects for many people.

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are mere objects but an integral part of those who have to put them on constantly. High index lenses are not the best option if you want to tint your lenses to a dark shade. High index lens density doesn’t allow to be tinted to a lot more than anything more than a light shadow. Alternatively, polycarbonate lenses omes with a coating that allows them to tint a lot more than the high index. You need to choose high index lenses as they’re lighter, thinner, comfortable, and attractive.

The second advantage of having a higher refractive index has been in a position to handle stronger prescriptions. All lens materials block some light from passing through the lens. This light reflects back from the lens surface, causing distractions and reducing the clarity of night vision. It’s not unusual for 1.67 high-index lenses and 1.74 high-index lenses to cost 3x to 4x the price of standard plastic or glass lenses. Eyeglass Tyler compares the professionals and cons of two popular lens materials, Trivex and polycarbonate, that will help you figure out which
The rigid thermoplastic is often considered 200 times more powerful than glass and thus utilized to make bulletproof windows and car shields. Hello people, today I will share an in depth analysis of high index vs polycarbonate lenses. However, thinner lenses won’t indicate they’ll weigh less. The same attribute which allows high-index to be thinner, helps it be heavier. With everything equal, polycarbonate is up to 18% lighter than high-index. The most commonly used lens materials today are Plastic (or CR-39), Polycarbonate, High Index, and Trivex®.

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If you are looking for thinner and lighter lenses, high index lenses will be a good choice. Besides, you have to know that the stronger prescription, the thicker the edges of the lenses. So, high index lenses are good choices because they are slimmer and lightweight. Polycarbonates are lighter than both glass and CR-39, offer superior durability and refractive index, even while being cheaper than glass lenses. These make plastic lenses perfect for active lifestyles and children. Despite having anti-scratch coatings, plastics can pick up nicks and scratches easier than glass – even if they don’t shatter or break like glass does. High index lenses are generally only used for stronger prescriptions that would otherwise require thick glass or plastic in order to achieve the right degree of refraction.

• Although many people prosper with polycarbonate lenses, some have trouble adapting to them as a result of visual quality.
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• For many, many years glass lenses where quite typical and popular because of natural resistance to scratches as well as a lack of worthwhile alternative lens materials.

Photochromatic lenses are excellent for people who usually do not wish to carry a separate couple of prescription sunglasses. Aspheric lenses are also much much lighter than standard spherical lenses.

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In this article, we are going to be discussing specifically plastic and polycarbonate eyeglasses and the major differences between both lens materials. Mid-index lenses, such as 1.54, 1.56, and 1.57, are thinner than glass, and nearly as strong as CR-39. It is lighter and much more scratch resistant and contains high-impact resistance like Polycarbonate. Glass lenses provide excellent optics, the most scratch resistant lens material and blocks UV light.
Polycarbonate lenses are gradually taking over a significant portion of the optical market share once dominated by plastic lenses. This is due to the fact of its lighter weight, impact-resistant, thinner and more scratch-resistant properties.
So technically we say that the lens materials with high refractive index, the typical glass or plastic lenses are considered as high-index. Developed in 2001, Trivex lenses are constructed from a newer plastic that shares many properties with polycarbonate. While also thin, scratch-resistant, highly impact-resistant and lightweight, Trivex lenses may be slightly thicker than polycarbonate lenses. For some vision prescriptions, they could give a better visual clarity and more scratch resistance than polycarbonate lenses. However, polycarbonate lenses have an increased index of refraction than Trivex lenses (1.58 vs. 1.53). Therefore, especially in high prescription powers, polycarbonate lenses will undoubtedly be noticeably thinner than Trivex lenses. Still, Trivex lenses are thinner than regular plastic eyeglass lenses, that have a refractive index of 1 1.50.
In 2016, she decided to combine her passion for writing with her experience being an Optician and launch her company, Pizzini Writes. She now dedicates her days to authoring the most recent optical-related news and trends for various publications and independent retailers. New digital versions of hi-index lenses are computer-generated and custom tailored to your prescription and frame measurements. Recommended for prescriptions from +3.00 to -7.00, and astigmatism correction between -3.00 and -4.00. Hi-index lenses are identified by their refractive index number. The refractive index measures just how much light is bent or refracted while passing through the lens.