Cr39 vs polycarbonate reddit Across Reddit threads old and new. Help choosing lens material (CR39 vs Poly vs others) good night! last week I found out I have astigmatism and I'm looking to order my first ever glasses. It seems to have an index of 1. i. Only go for polycarbonate if you need more rugged glasses because the optical performance is much worse, especially at the edges. I've been told that CR39 is the best for reducing the chromatic aberration, but it is not available with the green transition lens. TruttPublished: 5/28/2024Choosing the right eyeglass lens material is crucial for comfort, durability, and visual clarity. 25 ? Edit, the higher the Abbe number the better the optical clarity, right? CR39 apparently has an abbé value of 58 vs Trivex abbé value of 43-45 (polycarbonate is 30). Jun 5, 2015 · Polycarbonate Lens Optical Quality Is Significantly Inferior To Glass And CR-39. 74) tend to be a bit stronger, while 1. He's talking overall throughout the lens. Polycarbonate is a safe option since it is thinner, more impact resistant, and blocks UV. my prescription is a -2. 50 CR39 is apparently “immense“, “life-changing“ according to users. And the difference is significant. Polycarbonate vs. Thanks May 15, 2021 · Specify your type of "plastic", almost all lenses are plastic. 75 Axis: 173 Trivex will be $50 more, and I've heard some people actually have problems with Polycarb. In this guide, we’ll explore the most common eyeglass lens materials: CR-39 If you are looking for optical clarity it's best to look at the Abbe value of the material. Just get poly in you're Rx there will definitely be more than 1 mm in thinness between the poly and plastic cr39 This effect gives me nausea and eye strain. CR-39, Poly, Trivex, all plastics. Nov 19, 2010 · I explained these problems during my last eye exam and she recommended 'polycarbonate' which is thicker than CR-39 but less distortion than high index. Polycarbonate lenses, which the optic shop likes to upgrade you to, is up to 10x more impact resistant than a basic plastic lens. The reason is their durability. 57 and 1. Between poly and trivex, trivex is definitely the better material. That’s a large change. Do not know of they are CR 39 or polycarbonate. It seems like the bulk of the pricing comes from “upgrading” my lenses to polycarbonate, but now I’m starting to question if that was even necessary because the tech helping me out made all of the lens options very confusing. I recently got new lenses in an old pair of frames by lensabl. Trivex vs Polycarb. Glass is seldom prescribed though optics are better due to the dangers of shattering and getting glass in your eye. com and ordered plastic CR-39. 60 and Trivex are better quality optical alternatives to polycarbonate but opticians tend to price gouge on them so you may only get good value online. 75 will CR 39 lenses be noticeably thicker than polycarbonate? would rather go with plastic if possible for the price and optical quality, but don’t love the idea of having thick lenses. 50, -0. The main reason we don’t recommend CR39 much anymore is because it has terrible impact resistance. May 28, 2024 · By Jon J. CR-39 was first used as a plane windshield in WWII and Trivex was developed by the military in an attempt to make invisible armor. 3: yes, differences are huge between a basic coating and for example a Zeiss Duravision Platinum that comes with 3 years of warranty. I keep reading online about how polycarbonate is good for stronger prescriptions because the lens is thinner. 5. MR-8 1. 75 Axis: 180 Sphere: -1. If I am going for a polycarbonate, I will try to buy the Crizal Rock coat which help with scratch resistant. The visual quality for both these two is worse than for standard CR39 "resin". Many (most?) places will not put CR39 lenses into semi-rimless frames because it is a huge pain in the ass. While optically superior it certainly lacks in many other regards such as lens thickness, progressive availability, and no native UV protection. Trivex and other high index plastics have their own quirks such as higher reflectivity requiring high quality anti-reflective coatings. Let me know what you guys think plzzzzz thank you all! CR39 is 15 copay Poly is 31 copy Trivex is 48 copy Polycarbonate is much more shatter and chip resistant than CR39 - this makes it the cheapest option for most semi-rimless frames. 25 Cyl: -2. I know the optical clarity is better in trivex, but I'm concered about the thickness it will have with my RX, which happens to be Sphere: Plano Cyl: -3. 25 cylinder 75 axis on left, 67mm DP To make things more specific I am looking for greater clarity, colour perception and contrast (Kind of HD) and no fisheye/bulging kind of effect. 2: no, you can't use CR39 in a semi-rimless frame. I currently use normal no brand glasses. Mar 28, 2014 · I almost always go for the CR-39, when dealing with low prescriptions for that reason alone. Typically the standard CR-39 plastic has the highest Abbe value of any of the plastic lens materials. If you’re doing a semi-rimless or “half frame” pair get polycarbonate or trivex. e. Polycarbonate was first put into safety glasses in the 1980's, then prescription lenses, followed by sunglasses in the early 1990's. Whereas if the change between 1. 59 which has the highest of the materials listed. 00 L: -3. I am now debating between Trivex or CR39 for my new lenses. However, both poly and trivex are a bit overkill unless you're going rimless or have a tendency to get hit in the eye. You're correct in that the higher the index, the higher the chromatic abberations (Abbe number or V-number), again with the exception of 1. 5 cylinder 105 axis on right, -2. My opinion: Polycarbonate and Trivex are mainly worth it in rimless frames, and maybe semi-rimless too. They are a lot less dense, and they don't chip as easily as a plastic lens. Polycarbonate is poor optical quality in comparison to trivex, so that's one plus to trivex. . 75 +0. cr-39 lenses are very good lenses for clarity. cr-39 may be thicker, but no where near as people think. I'd argue it's more than a MM from what I've measured. The good old CR-39 plastic lens will do just fine for you. CR-39 is superior to polycarbonate in many ways, most notably in optical clarity and scratch resistance. 59 can be considered to have the highest impact resistance. I find it more of an issue in round frames. I can't say there is one objectively best option. As well as online verified sources. The variety of materials available today can be overwhelming, so understanding the benefits and drawbacks of each can help you make an informed decision for your patients. Polycarbonate lens quality is quite a lot worse and Trivex is slightly worse than With your script, I would probably recommend poly or trivex (though honestly depending on your frame choice you could probably get away just as well with CR39 plastic). CR39 "plastic" has the best optical performance. CR-39 lenses for my prescription? I want to buy glasses from this specific shop and they have two lenses options (polycarb & cr-39) in my prescription range: R: -4. This subreddit is for things related to glass. And also, when I say “significant“, well, the difference between say 1. You’re risking serious lens chipping with CR-39. 50 “regular“ and 1. 25. But CR-39 would only be marginally thicker for you, plus if you are getting AR coating odds are it will come with UV blocking as well. The only lens that is better than cr-39 is glass. 67 is really minor, say so! Get the Reddit app Scan this QR code to download the app now CR-39 vs Trivex vs Hi-Index . However, these somehow seem to have Caveats: if you’re doing a drill mount / 3 piece mount / “frameless” pair, get trivex. Someone at Warby suggested I may have a sensitivity to poly, and had me try the plastic CR-39 lenses, which ended up being perfect. What you gain in impact resistance and higher index, you pay for in how the lens transfers light into your eye. If we’re going off Abbe values, it seems like plastic is best 1: no, you won't notice any difference in optics. High index plastic lenses (except 1. CR39? I’ve read trivex is optically clearer, will that make a visible difference at, say, a fairly mild prescription like -1. 25 +0. The hype used to be all about polycarbonite. I asked this online place what their in-house lenses were made of and they said that all of their non-polycarbonate lenses were made of different indexes of CR-39. I personally really don’t like that Polycarbonate is a soft plastic and much more prone to scratch than CR39. Optics is constantly trying to make lenses thinner and lighter. 4: yes, as mentioned before, due to technical reasons you can't use CR39 in all types of frames (semi-rimless seeing mixed answers, for my sphere of -2. It is easy for those lenses to shatter and nobody wants shards of plastic near their eyes Tons of good opticians use, and recommend, CR39 on a daily basis. They didn't give me any Abbe values. I know transitions are a point of contention for some, but I'm just too flakey to keep up with an additional set of (sun)glasses. I want the page to look flat as it is in reality. Polycarbonate is not as good optically. There are two notable exceptions: Intended Use. Yes you run into decentration but we are so precise now it doesn't matter. Lens materials do not degrade the quality of the vision in the lens. Drinking glasses, eyeglasses, glass windows, people wearing glasses, anything made of glass. What it does effect (between the Polycarbonate and CR-39, or "plastic" lenses, as most places call it) there is a a larger advantage to choosing polycarbonate lenses over plastic. It’s also safer in terms of shatter resistance. CR-39 is a great material (Abbe score of 58 - really good) but I didn't think it came in different indexes. Also, typically, visual acuity is better through poly than through cr-39 which is basically plastic. You need durability in frameless glasses lenses. So I've been given a choice. yrpel brbvbko rxqxgwt wkyhs ntz vguuo slitrovr cpexwv aqc vvje dccomkd vcflc zhjj hhghxqv isgt