Besides lens thickness, there is a difference in visual clarity between plastic and polycarbonate lens materials. Your eyes also must look through the thickness of the lens in order to see. You can feel that they are heavy and weighing down on your face.
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Polycarbonate lenses are a very common.
The cr stands for “columbia resin” which is the polymer that the material is made out of and the 39 means that there were 38 other “columbia resin’s” that didn’t make the cut for optical lenses.
These lightweight lenses also offer 100% uv (ultraviolet). Polycarbonate lenses are a great choice not only for safety, but for making your lenses thinner and lighter. Plastic lenses are thicker than other lens materials because of their low refraction of the index. The abbe value measures how much the lens material disperses light.
However, thinner lenses won’t necessarily mean they will weigh less.
Polycarbonate lenses are about 10% thinner than trivex lenses. Lens materials affect thickness and weight. Polycarbonate has a higher index of refraction than trivex (1.58 vs. Meanwhile, polarized sunglasses have special filters.
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There are more measurements and factors to consider when it comes to choosing lens thickness. The higher index plastic material is not as widely popular as the general ones but still is more suitable for people with higher optical prescriptions. If your prescription is higher than that, you would achieve a thinner and lighter lens by selecting a lens with a higher index, 1.67 or above. Up to 20% cash back polycarbonate lenses are recommended for children and active/sporting adults.
1.53), so polycarbonate lenses are about 10 percent thinner than trivex lenses.
These lenses are thinner and lighter than conventional plastic eyeglass lenses. Consider choosing a plastic rimmed frame that will help to hide any central thickness much better than a metal frame. Polycarbonate is a different type of lens material that’s thinner and lighter than regular. The impact protection on polycarbonate is so good that both safety and sports eyewear use polycarbonate for their lenses.
Polycarbonate lenses first hit the market in the 1970s (as safety glasses) and, by the 1980s, were the lens material of choice.
With all things equal, polycarbonate is up to 18% lighter. Plastic lenses are usually thick due to their low index of refraction compared to other lens material. Trivex lenses about 10 percent lighter than polycarbonate lenses. Eyebuydirect’s polycarbonate lenses are cut at a 1.59 lens index.
It helps prevent glare and intense light reflection.
Boast scratch resistance so they last longer than regular plastic lenses. How thick will my lenses be? 10 times more resistant to impact than plastic eyeglasses, so they don’t shatter or break as easily. Every lens material has what is called an abbe value.
Keep in mind that the stronger the prescription, the thicker the edges of the lenses.
To conclude, this is a general guide about lens thickness. Polycarbonate lenses are naturally 100% uv blocking and extra durable. Polycarbonate lenses are not as clear as glass lenses, but the difference is not really significant to most people. Try to order a frame that is greater than 50mm in diameter.
Still a popular option today, polycarbonate.
You can select the thickness of your lenses at eyebuydirect by choosing a. One of the biggest drawbacks to standard plastic lenses is their lens thickness. Trivex has a lower specific gravity than polycarbonate, making trivex lenses about 10 percent lighter than polycarbonate lenses. Essilor’s polycarbonate lenses are 20% thinner, 30% lighter, and 12x more impact resistant than standard plastic lenses.
So the user can get a clear view.
From these examples, we can confidently determine that when dealing with a stronger rx, lens. The refractive index of polycarbonate lenses is 1.59, which means that they tend to be 20 to 25 percent thinner than plastic eyeglasses. Trivex lenses have less internal stress and may produce sharper central vision than polycarbonate lenses. A photochromic lens will darken easily following exposure to extreme light and change lighter with insufficient light.
The edges of these lenses will need to be thicker in order for them to be glazed correctly.
Lens indexes exist are of 1.50, 1.53, 1.59, 1.70 and more. With certain prescriptions, the lenses come very thick in the standard plastic lenses. If you do require a strong prescription, many different frame options will hide the thickness of the lenses, if you desire. There are things like spherical and aspherical lens where aspherical lens is thinner than spherical for the same index.
