There are no telltale signs to distinguish high index lenses from standard material lenses; no industry-required stamp or barcode to set high index lenses apart. For the most part, confirmation is a matter of visual inspection.Jun 12, 2021
How do I know if my lenses are polycarbonate?
Try to edge it by hand, if it has strips adhered to edge, it's poly. Hit it with a hammer, if it doesn't break and bounces, it's probably poly. If the optics aren't as clear as glass or plastic, it's poly. If it's minus check the center thickness.Jul 9, 2007
What is the difference between polycarbonate and regular lenses?
Polycarbonate lenses are made of a type of plastic that is more impact-resistant than standard plastic lenses. Polycarbonate lenses are also much thinner tvand lighter in weight. They are considered a high index plastic. Polycarbonate lenses also have built-in ultraviolet protection.Apr 14, 2020
What index are polycarbonate lenses?
1.586
At what prescription do you need high index lenses?
A high-index lens may be recommended if your optical prescription is above 2.00 diopters. High-index lenses have a refractive index above 1.50— ranging from 1.53 to 1.74.Nov 25, 2020
What is the difference between high index and polycarbonate lenses?
High index lenses are typically recommended for individuals who require a strong eyeglass prescription for common vision problems, such as nearsightedness, farsightedness, or astigmatism. ... Because of their durability, polycarbonate lenses are much less likely to break or fracture than even high index lenses.Sep 17, 2019
What is the benefit of high index lenses?
High-index lenses bend light more efficiently than a standard lens, which means thinner, lighter lenses can be used to correct nearsightedness, farsightedness, and astigmatism. This is especially important for people with severe vision correction needs, as traditional lenses will be thick and heavy.Nov 5, 2019
Is high index lens good for eyes?
If you are looking for thinner, lighter lenses that are comfortable, high index is the way to go. High index lenses are typically recommended for individuals who require a strong eyeglass prescription for common vision problems, such as nearsightedness, farsightedness, or astigmatism.Sep 17, 2019
Is polycarbonate high index?
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 recommended for people in jobs that are high risk for eye injury and for anyone under the age of 18.
Is there a big difference between 1.67 and 1.74 high index lenses?
The difference between 1.67, which is considered regular index and 1.74 is quite small, and really, the only way you'll notice the difference is if you have a prescription below a -6 or above a +4. However, if you are in need of a very strong prescription, it is absolutely worth the additional cost!
Who needs high index lenses?
What are high-index lenses? High-index lenses are eyeglass lenses that are designed to be thinner and lighter than regular lenses. They are generally recommended for people who have significantly high refractive errors and strong prescriptions for nearsightedness, farsightedness, or astigmatism.Nov 25, 2020
Who should get 1.74 high index lenses?
Hi-index 1.74 lenses are perfect for: People with +/- 2, and stronger prescriptions. People who are self conscious about the thickness of their lenses. People who wear contacts because traditional lenses distort their eyes.
Do I really need 1.67 high index lenses?
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. From there, if you have a prescription over -6.00 diopters, a 1.67 high index lens is a worthwhile upgrade.Aug 30, 2013