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Eye Glasses Material & Coatings Cheat Sheet (DRAFT) by [deleted]

Eye Glasses Material & Coatings

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Introd­uction

Choosing the right lens material for your eyeglass frames is an important step in the process

Lens Material

Poly­car­bon­ate: Although this material is impact­-re­sis­tant, it still scratches easily. Truth is, it’s an older industry lens material, and while still functi­onal, it’s not the best choice. Kind of like that VHS player you have stored away in the basement, it may still work, but modern technology offers other, more advanced altern­atives. Still, it’s worth noting that children’s lenses should be made of polyca­rbonate or trivex for your child’s safety

Triv­ex: This material is both impact- and scratc­h-r­esi­stant. No wonder our opticians like it the best. And because it’s also highly durable, Trivex is the preferred lens option for children’s eyegla­sses, rimless and semi-r­imless frames, and frames designed for safety eyewear. Hands down, it’s the most durable lens material available today.

Hi-I­ndex: For people who want the lightest, thinnest specs with UV protec­tion, hi-index lenses are the perfect solution. High on comfort and attrac­tiv­eness, these lenses come in varying degrees of thinness, measured by an index that ranges from 1.6 – 1.67 – 1.70 – 1.74

Coatings

 

Lens Treatm­ent­/Co­atings

Scra­tch­-Re­sistant Coating: Although this special coating helps resist scratches on the surface of the lens, it is not scratc­h-p­roof. If handled improp­erly, the lens can still be scratched.

UV Protec­tion: Ultrav­iolet radiation can play a signif­icant role in the develo­pment of various eye condit­ions, such as cataracts, skin cancer, pterygium and macular degene­ration. That’s why we’re committed to only selling sunwear with 99- to 100-pe­rcent UV-A/UV-B protec­tion.

Anti­-Re­fle­ctive Coating: This is especially useful for night driving as it helps to avoid the blinding effect from headlights and street­lights. It’s also helpful for people who spend a great deal of time staring at a computer screen, which can lead to eye strain and is often associated with symptoms like blurry vision, dry eyes and irrita­tion. Have you ever noticed that a glare on someone else’s eyeglasses can prevent you from seeing that person’s eyes? It simply means that his or her specs don’t have an anti-r­efl­ective coating

Pola­riz­ati­on: A favorite of sports enthus­ias­ts—­esp­ecially boaters and fisher­men­—this technique blocks danger­ously intense glare, which is the result of scattered light traveling in a horizontal direction. Polarized sunwear lenses reduce the glare with a special filter that blocks the intense reflected light

Phot­och­rom­atic: This type of lens gradually adjusts its tint level in response to UV light exposure. You may have heard of brands like Transi­tions or Driveware. Photoc­hro­matic lenses eliminate the need to switch to sunglasses when you venture outdoors for most activi­ties. Much like sunblock protects your skin, these lenses block out 100 percent of the sun’s harmful UV rays. Unfort­una­tely, because Transi­tions need UV light to activate, they won’t darken when you’re driving a car. That’s because car windsh­ields have built-in UV blockers. Driveware, on the other hand, is always tinted and will darken in the car but will not transition to totally clear indoors, making it an outsid­e-only lens