How To Identify Lens Materials
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- čas přidán 22. 07. 2024
- This week we cover how to identify eyeglass lens materials. We examine glass, polycarbonate, Trivex, Tribrid, CR-39 and two high-index materials, 1.67 and 1.74. Opticians sometimes need to identify lens materials when finishing eyeglass lenses. Optician training includes practice on determining material for proper lens edging. Lens finishing lab equipment will require the proper setting to edge a lens. Here we cover the feel, sound, smell and look of various eyeglass lens materials and how-to identify them.
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This video lesson is sponsored by Laramy-K Optical
Laramy-K Optical is a digital uncut and coating lab unlike any other. The only exclusively uncut lab in the country; we provide our customers with independent, high-end alternatives to corporate brands. Through craftsmanship, technology, and independent, innovative vendors like Younger, IOT, A&R, and Quantum Innovations we offer our customers the Integrity portfolio of freeform lenses and coatings. Made in the USA, the Integrity brand is not a generic house-brand, but is the absolute best available, designed to give the wearer that “wow!” experience.
In addition to the digital line, we still offer conventional surfacing, including glass. Maintaining traditional equipment gives our customers vastly more flexibility in their dispensing, particularly when it comes to more difficult prescriptions.
Learn More: www.laramyk.com
just started working in an optical medical office and your videos really helped me
I'll be more happy when I meet him one day and the buy him a cup of coffee. I love his videos.
John, thank you and all the people involved in the production of this great video. The information in this video is needed throughout the optical industry. And I agree with you John, Laramy-K Optical the best wholesale surfacing lab in the county.
G Voice SSI we are professional freeform lenses manufacturer in china. Our lab equipped with Top brand producing machines from Germany satis loh, Schneider, France SCL.
We already got many clients from all over the world. Ups/fedex express to the world only costs 2-4days.
Expecting cooperation.
whatsapp 008615862991717 www.select-optical.com
Another wonderful video John, thank you for sharing your time and experience! :)
Thanks for watching!
I am a lab tech for my dads practice and I still learn some things just by watching this channel.
Awesome
Dustin, Thanks! I guess we are doing something right! John
Dustin Platt we are professional freeform lenses manufacturer in china. Our lab equipped with Top brand producing machines from Germany satis loh, Schneider, France SCL.
We already got many clients from all over the world. Ups/fedex express to the world only costs 2-4days.
Expecting cooperation.
whatsapp 008615862991717 www.select-optical.com
Thank you for sharing, I continue learning a lot. Love to watch your videos.
Very refreshing in this mind
Thank you for the information
Thank you for your class of How To Identify Lens Materials... see you next time...
VERY informative THANKS
Glad you liked it. John
Great information!!! Now I get my New eyewear!!!
Hi, great video! What material would you say is the best for having the thinnest possible lens and for aesthetic purposes?
No easy answer there! I'd need to know what the lens powers are before knowing what might be best. If you have high powers then a stock 1.74 will be thinnest. If your power is outside stock range then you may do as well or better with a 1.67. If you are talking +/-5 and under then Trivex or poly.
Thanks. How'd you know if it's Triacetate (is that Trivex)?
Will polycarbonate and triacetate block 100% UV (clear color)?
Thanks.
thank you so much
Good teacher
I got trivex eye glasses but the lenses seem thicker than my previous poly lenses. I did the sound test but they sound like plastic rather than poly. I think the lab at my optical may have given me cr39 by mistake. I am checking your video to make sure before I go back there, I want to make sure thanks
???? If you got Trivex instead of polycarbonate then they would look and sound more like old plastic. But they may well be lighter than the poly and you should see a little better out of them. Trivex, poly and CR-39 are all different things. John
Where i can take this course PLEASE let me know? THANKS
This was an extremely good video. I am a consumer. What is the difference in price between Polly and trivex for a progressive lens? What name does Essilor give trivex because I spoke to somebody and they had no clue.
That will all depend on who is selling it. Sorry not trying to be funny - different places will mark it up different ways. I don't think that Essilor has a brand name for Trivex since Trivex is a brand name but they might, they just might... John
I can't find anything online. Does digitally surfaced SV lenses change the Abbe value at all?
No, and if you are working in the field the question tells me you really need to work through the OpticianWorks optician training program. If you are a consumer Abbe comes from material properties not surfacing techniques.
Hi John.... . Im in a bind and hoping you have some advice. I have several old pairs (15+ yrs old) of high index glasses which are fine, but when I try to wear new/modern glasses of any material, of the same exact correction, I feel cross eyed and dizzy. Are today's materials different than 15-20 yrs ago? Is there somewhere I can still buy the old material ? Thank you!
If you came to me I'd take a really close look at those old pairs of glasses first. Take every possible measurement (steal every possible measurement) and duplicate, duplicate, duplicate. My guess would be a mistaken PD in the old pairs? Vertex, frame angles, frame sizes, wrap, material... Because, IMO, no, materials haven't really changed in the last 15 years. The chemical makeup is the chemical makeup. John
@@LaramyKOptical Thank you for the reply! Where are you based? Might need to visit. I have 2 different pairs from back in the day, both are high index, both are comfortable. Anything new I try is disorienting, even though the doc says the correction is identical (though new glass worked out a LOT better than new high index)
@@andy42x I'm in SC on the GA border. I'm not a retail shop but willing to wrk with people. John
I'm in NY and I took the Opticians Practical Exam. During the exam I had to of course Identify the lens material. As I began attempting to remove the lens from the frame the examiner told me not to take the lens out of the frame. As a result I was unable to determine the lens material correctly based on what I had learned up to that time. Tapping the lens with a ring or even a plastic ruler is still very hard to determine the material. What other method is there that I could learn to Identify what material the lens is while still in the frame and if the lens has no material marking?
Well, IMO, unless it was a glass bifocal that sounds like a pretty silly practical exam question. But, you really should be able to tell poly when it is mounted in a frame and tap it with a ring. Other than that it's all a best guess. If you have to take it over I'd work on process of elimination over actual identification? Assuming a multiple choice question and answer format... John
@@LaramyKOptical Thanks! Most likely they won't use glass in their exam and of course if they did it would be easy to identify even in the frame. My wife and I have about 30 frames here at home with frames and lenses with both poly and plastic and maybe 1.67 index. Tapping the lenses with a ring(metal) or a plastic PD stick is a very misleading sound. It is very tough to tell when the lens is in the frame. I always heard of identifying the lens material when the lens is outside the frame. And, I was told that is what would be done during the test. That isn't what happened and I don't know why. I will work on trying to figure it out while the lens is in the frame. Thanks for your reply!!! My wife and I watch your videos and we like them.
So, pop it, drop it, grind it, sniff it, tell the customer your guess... and that they need new ones because the current ones has drop and grind marks. If you are a customer relations collector it might be a good idea not to do the dropping and grinding in front of the customers. The drop sound might be a bit unpleasant to them and they might not like to have the grind dust of their lenses sprayed on them. 😁
Good insight!
I'm struggling to find the exact same lenses I have in my old glasses. Is there any machine that can appoint the necessary features (mainly index)? Thanks!
Sort of, but very few shops will have the tool(s) necessary. With your lens powers it shouldn't be all that hard to figure it out. Go with Trivex or a low 1.6X and you should be just fine. John
@@LaramyKOptical Thanks a lot, John! Your videos are very helpful.
@@LaramyKOptical im going yo buy new glasses and need help on what to saying to optician. As find it hard to concentrate reading book. I always need to have contrast, big letter and bold letters. Is there something optician can do to improve this. As looking away from the center is less demanding. but looking close up on objet is damaning. with the current glasses i have and this is the expensive one. Also i have been reading some of my old medical papers. And the doctor only added higher prescription. But could not fix the problem
@@square5726 I'd start with a visit to a good ophthalmologist not optometrist. After you rule out any medical reasons email me through the OpticianWorks website. John
Is there a way to identify the material of my glasses without dropping it like that? It's already attached to my glasses frame.
I have a question: what company makes lenses for Lindberg eyeglasses?
Not 100% sure what you asking but --- in general you need to get your lenses for a Lindberg mount from an "authorized" Lindberg dealer. That is not an absolute and if the place says, "we do them all the time" then you should be just fine. It's just a grooved lens but working with the frame is the tricky part. Any large wholesale finishing lab should be able to handle the work. Does that help? John
Apart from cutter and Grinder what machine do you use to fit plastic mirror into frame
Sign up for the free course on finishing at OpticianWorks.com.
@@LaramyKOptical i am already working under optician. Just wanted to know how you do it in your country
@@krishanlal5680 opticianworks.com/about-opticians/
I wish there was a way to tell lens material when they are still installed onto a frame.
Laramy-K Optical - When you take the edge of a polycarbonate lens to a hand stone, it will shed off in little plastic strings, which is a dead giveaway. CR-39 will powder and high index wont.
Matthew we are professional freeform lenses manufacturer in china. Our lab equipped with Top brand producing machines from Germany satis loh, Schneider, France SCL.
We already got many clients from all over the world. Ups/fedex express to the world only costs 2-4days.
Expecting cooperation.
whatsapp 008615862991717 www.select-optical.com
Thanks i need more vedios svweatha
Thanks. We add another every week. ;)
John, speaking of lenses, I recently heard that a lens can actually turn-shift in perfectly round frames My question is, is there a way to stop a lens from doing this? I'm not an optician, but I do enjoy round frames. Any suggestions would be greatly appreciated.🙂
czcams.com/video/E1s9zZM2JPU/video.htmlsi=P4lSjiI09sCePhVS
Other than a very snug lens fit not much you can do about it. Progressives you can check the 0-180 orientation marks. High cylinder you might check thick edge position. Best defense against it is a good edger. But no glues or anything.
@@LaramyKOptical Thanks for this, Larry. Curious, do you personally see any customers where this actually happens?
@@sinatralala Not that I recall. A lens loose enough to rotate would be a lens that you would feel wiggling around in the eyewire. And most important even the most round isn't actually a perfect circle. I would guess it might be a problem for the aggressive lens cleaner.
Thanks John. Much appreciated.@@LaramyKOptical
What lens material has the best optical quality?
AncientAlien815 trivex
Glass, plastic, then poly
I really like the 1.6 and the 1.67. the hardcoat is better, you can take the lenses longer.
Other schemes: measure index by using lens clock on both sides, calculating refraction, then comparing that to reading in lensometer. (For cylinder lenses use strongest axis.) This only works on lenses that are not plano.
Other scheme is to measure density. Tie thread on lens and hang on small gram-scale. Lower lens into water and note reduction of weight. Let R be ratio of weight in air to weight in water. Density of lens is R/(R-1)
To get better "smell signal": heat small nail to red heat, touch to edge of lens. A small whiff of smoke will come up which you can smell. Grinder method you used works best if cooling water is turned off and stone is dry.
www.optiboard.com/forums/showthread.php/68287-This-Weeks-Video-Release-How-To-Identify-Lens-Materials
If the following comment makes no sense, it’s because I posted it on the wrong page. But the comment, best lab in the country is true.
Well, then it makes perfect sense! ;) -Keith
You forgot to do smell at the end. You should drop -2.00ds of each material one after the other so we can hear the differences back to back. It’s not easy to remember HI vs trivex by the end of your video.
Good suggestions. Can't say we'll be doing another anytime soon, but I think we managed to help a few people anyway. Thanks for watching.
Gold Wolf, John here - -2.00 is not a power that is available in all materials. Higher index lenses start at higher power ranges. Yeah, I only did the sniff test on the materials that I already new had an odor. My bad! Good catch!
so what does WT stand for? What lens is that, genius?
In my experience, edging a surfaced Tribrid lens will result in THE WORST SMELL. Way worst than 1.74. Interesting that the finished lenses didn't smell. Also, for those looking to determine high indexes by smell- remember that the higher quality of hi index (MR-8 / MR-10) will also smell stronger than cheaper versions.
tutie9, Gotta admit I never edged a Tribrid and I guess I'm glad I didn't. Is it worse than the stench of microwave popcorn? I didn't know that about quality and smell. Thanks for posting this! John
It's like someone burnt hair and popcorn at the same time and then some. Things best left unwritten, if you catch my drift!
I do. I do. [Reminds me of the opening sequence of Deadpool when he is in the cab explaining what Mama June smells like after hot yoga...] John
That's true.
at what mode do you (process) polish1.6 tribrid lens, on my Lex1000 on trivex mode i get awful polished edge
Love u sir Hindi my bi video bna do
From personal experience:
CR-39, looks cheap AF.
Polycarbonate, looks kind of thick and very "smooth".
1.67, looks like expensive lead crystal.
1.74, looks like "water" or window glass.
Also at what power will a patient notice a difference between digital and non digital SV lenses
No fixed power or chart or anything but I suppose around +/-5D and anytime cylinder is getting high. Mathematically none of the point of wear compensation stuff matters until 8D and then would it matter to the wearer?
I hate the smell of poly it reminds me of the smell of teeth being drilled.
Blah blah blah come straight to the point. Make videos short, very short.
Dinesh, As I always say, if you can do better please go ahead. Send me a link to your work and if it is any good I'll share it with my audience. If want any help getting started juts ask I'll send you our equipment list. Peace. John
Dinesh, Changing the playback speed to 1.25 helps.