Not many competitive opticians like you. Actually I dont know anyone in were I live. Im actually trying to learn from you to make good decisions choosing my lens! Thx youre a master!
Gracias Laramy ...👍👋Don't get frustrated and don't get discouraged... I also appreciate, for worrying about those who follow your teachings of optics...
Hi! I got a new pair of Essilor Ormix 1.6 with 41 Abbe and the CA is very noticeable unfortunately. And that's in a 48mm frame with (-3.0, C-1.0; -3.25) prescription. Very noticeable meaning when I sit in front of my computer (at arm's length) I can notice it on the contrasting edges that are closer to the edge of the screen (and on the black bezel surrounding the screen ). It's not that pronounced but it is there. I should probably get a pair of CR39 for home use into my old frames huh Btw, he intro was so worthy of a like!
Essilor named CR 39 lens as “ ORMA “ Which is best for everyone with highest abbe value of 58, by the way, i am wearing Zeiss DRIVE SAFE CR39 1.498 index. And its the best solution for everyday life. It also came with UV 420nm protection.. i have tried ESSILOR CRIZAL 1.498 index previously. Zeiss is far better than essilor ..
Blue light protection comes from a coating not the lens material. Any material can have the coating applied. Blue light is not part of the UV wavelengths that can sometimes be blocked by material alone.
Laramy-K Optical thank you for responding, I am very confused now please what brand or lents is good to buy? Just need it for my work I am working a lot time in computer. Thank you for this video tried to see many times to understand and learn.
Well sir if you could explain about different coating used on lenses with their chemical names like what are ARC lenses BLUE coating PHOTO grey or brown , four line or six line glass etc.
On that note, if i had a customer that is experiencing "seeing the rainbow" should i just assume poly non-adapt or should my first step be to assume that the lens was probably wasnt manufactured correctly? In-other-words, is it worth to remake in poly again or should i go straight to CR?
Poly “non-adapt” isn’t really a thing. It’s more of an ill defined concept in the eye care community. That’s NOT to say people don’t reject lenses do to chromatic aberration! They certainly do! But the belief that poly is so optically inferior that people cannot even wear it is not accurate. People cite the fact that poly has the lowest abbe value as justification but when compared to other high index materials they perform equally poor. 1.67 & 1.74 have abbe values of 31 and 32 which are marginally better than polys 30. But is that difference enough to justify poly as being optically inferior to either 1.67 or 1.74? Let’s assume we have a patient with a -6.00 Rx. If they look 6mm away from the optical axis this creates 3.6D of prism. To calculate the amount of lateral chromatic aberration you divide the amount of prism by the abbe. For poly the wearer will experience approximately .12 diopters of LCA. 1.67 = .116D and 1.74 = .11D A person would need superhuman vision to notice a difference of .01D of LCA. A person with sensitivity to light dispersion would have difficulties with all three materials. Yet poly is the only material on the market to have earned such a negative reputation. Much of this is from when the material made its debut and was plagued with manufacturing issues and compared to the dominant materials of the time, C.R.-39 and Crown Glass, it’s abbe was significantly worse. Proponents of the “poly non-adapt” concept cite countless instances in which switching the wearer to another material resolved the issue. This is anecdotal evidence and not a controlled experiment. A likely cause of this result may be the placebo effect which has been extensively studied. Recently I had a patient come in for an adjustment. He stated how he absolutely cannot wear poly lenses. An ECP friend of his confirmed that this was a common phenomenon. He then asked if we could duplicate his lens as he has never been so happy with glasses as he has been with these. Turns out they were poly!! He was a little dumbfounded! The point of all this is that the parameters and variables involved in why a patient rejects or accepts their eye wear are numerous and multifaceted. Vague catch all terms like “poly non-adapt” have become mental shortcuts for when an ECP needs an explanation but lacks the knowledge or comprehension of what other variables might be in play. Poly non-adapt should be replaced with abbe sensitivity within the eye care community.
Also Andrew, I applaud the fact that you realize that other variables are in play and haven’t adopted the dogmatic position many ECPs take by simply stating poly is the problem and that’s the end of it
why you can see the rainbow in the lens? here is the reason: before lenses under the anti-glare coating room, the lenses should be immersed in the hard coating liquid. 1.5 index lens should use 1.5 index hard coating liquid, 1.59 poly lens should use 1.59 index hard coating liquid. if you make 1.5 index lens with 1.59 index hard coat liquid, it will cause rainbow problem.
That three part series are among my favorites we have ever done. Not pure optician stuff but I sure did learn some new things! Including that what we were taught all those years ago was wrong.
When I wear polycarbonate Rx lenses, I am able to pickup the chromatic aberration. So I always get CR-39. I recently got a pair of Polycarbonate Transitions Xtractive Grey lens with a blue flash mirror and I could not pickup the chromatic aberration. Why?
That combo means a lot less light getting through! A LOT LESS LIGHT so less of a chance to catch the aberration. Did they get a back-side AR as well? That would be another reason.
I did a high power reader and specified an oc in poly for a woman who insisted on a large frame. She experienced photocromatic. Was the abbe principal in play here?
Hi You explain very well I had to get technical knowledge about stock lens casting which is made from mold. for example R - 3.00 sph - 200 cyl is made from mold, then how do I select mold?
Are you saying you are creating your own lens molds? Whoa! I guess I would find a lap tool series and work with them as the "negative" of the concave molds. You have to have someplace to start. Then it's the nominal lens formula corrected for material and sometimes thickness. If you have a mold series I guess you would clock the two surfaces, correct for index and use the nominal lens formula? There has to be a chart or software of some kind that would go with the molds.
@@LaramyKOptical I have -2 and -1 astigmatism, and I can see huge cromatic abberation, and also if I look slightly off the lens' center everything is blurry... before these new glasses I had one that had only -1.5 of myopia and it wasn't noticible, but now it is, is this change the cause or could be a defect or something? should I get them redone with a different refraction index?
@@Gadottinho Going from a sphere of 1.50 to a lens with sphere and 2 and 1 of cylinder is going to change things. BUT - something doesn't sound right. You should have at least 15mm of clear vision around the center of the lens with eye movement. (much more in most cases) You should never experience "huge" chromatic aberration. Sounds like maybe multiple problems and I suggest trying another shop and starting over.
@@MehrOptic I'm really not sure what the question is? Since you are reducing the amount of light entering the lens by tinting it the lens will be far less prone to any issues with Abbe. Abbe is related to material and materials respond in different ways to tinting - that is covered in other videos. But that isn't the same thing as Abbe having an affect. Sorry but I can't really see anything related to tints - sunglasses - power and Abbe. Of course I may be missing something! John
@@LaramyKOptical dear john You’re as a teacher to me I watch your videos times and times And I really learn many things from you You are my teacher and you inspire me i hope that one day i become an optician like you 😍😍
I love how passionate you are about all these subjects. Respect to you for becoming so good at your craft.
That is one of my favorite videos that we have ever done. Glad it comes across in it. John
Not many competitive opticians like you. Actually I dont know anyone in were I live. Im actually trying to learn from you to make good decisions choosing my lens! Thx youre a master!
You did your best! Tomorrow I have a physic presentation about dispersion of light and this video was the best vide I ever watched.
Thank you very much, Arlon, and good luck on your presentation!
Gracias Laramy ...👍👋Don't get frustrated and don't get discouraged...
I also appreciate, for worrying about those who follow your teachings of optics...
Always a good video. Thanks for always putting it in simple terms for us optician brains. I enjoy physics but I need it in simple terms. Thanks
Very nice and helpful video ...
I'm an AR Coating operator and also learn some new and good things from your video.
Excellent!
Hi!
I got a new pair of Essilor Ormix 1.6 with 41 Abbe and the CA is very noticeable unfortunately. And that's in a 48mm frame with (-3.0, C-1.0; -3.25) prescription.
Very noticeable meaning when I sit in front of my computer (at arm's length) I can notice it on the contrasting edges that are closer to the edge of the screen (and on the black bezel surrounding the screen ). It's not that pronounced but it is there.
I should probably get a pair of CR39 for home use into my old frames huh
Btw, he intro was so worthy of a like!
Essilor named CR 39 lens as “ ORMA “ Which is best for everyone with highest abbe value of 58, by the way, i am wearing Zeiss DRIVE SAFE CR39 1.498 index. And its the best solution for everyday life. It also came with UV 420nm protection.. i have tried ESSILOR CRIZAL 1.498 index previously. Zeiss is far better than essilor ..
I have -2, c-1.0 and it's pretty noticeable with a 1.59 lenses, so bad, honestly
lovely stuff
The CR39 lenses is it material to buy blue light or Polycarbonate?
Blue light protection comes from a coating not the lens material. Any material can have the coating applied. Blue light is not part of the UV wavelengths that can sometimes be blocked by material alone.
Laramy-K Optical thank you for responding, I am very confused now please what brand or lents is good to buy? Just need it for my work I am working a lot time in computer.
Thank you for this video tried to see many times to understand and learn.
Very good explain. 👍
You’re the best! Cool explanation.
Thanks. That series of 3 are among my all time favorites. Last time I learned new stuff and had a "oh wow" moment.
I am very satisfied with this video...
Well sir if you could explain about different coating used on lenses with their chemical names like what are ARC lenses BLUE coating PHOTO grey or brown , four line or six line glass etc.
Very helpful ,thank you sir very much for that, keep up the good work.
Terrific!!!! Thank you
You are welcome. That may be my favorite video of all time. John
Very informative. Thank you.👍
Thank you, that was very good
On that note, if i had a customer that is experiencing "seeing the rainbow" should i just assume poly non-adapt or should my first step be to assume that the lens was probably wasnt manufactured correctly? In-other-words, is it worth to remake in poly again or should i go straight to CR?
My opinion = Switch them to CR-39 or Trivex, or 1.60.
Poly “non-adapt” isn’t really a thing. It’s more of an ill defined concept in the eye care community. That’s NOT to say people don’t reject lenses do to chromatic aberration! They certainly do! But the belief that poly is so optically inferior that people cannot even wear it is not accurate. People cite the fact that poly has the lowest abbe value as justification but when compared to other high index materials they perform equally poor. 1.67 & 1.74 have abbe values of 31 and 32 which are marginally better than polys 30. But is that difference enough to justify poly as being optically inferior to either 1.67 or 1.74? Let’s assume we have a patient with a -6.00 Rx. If they look 6mm away from the optical axis this creates 3.6D of prism. To calculate the amount of lateral chromatic aberration you divide the amount of prism by the abbe. For poly the wearer will experience approximately .12 diopters of LCA. 1.67 = .116D and 1.74 = .11D A person would need superhuman vision to notice a difference of .01D of LCA. A person with sensitivity to light dispersion would have difficulties with all three materials. Yet poly is the only material on the market to have earned such a negative reputation. Much of this is from when the material made its debut and was plagued with manufacturing issues and compared to the dominant materials of the time, C.R.-39 and Crown Glass, it’s abbe was significantly worse. Proponents of the “poly non-adapt” concept cite countless instances in which switching the wearer to another material resolved the issue. This is anecdotal evidence and not a controlled experiment. A likely cause of this result may be the placebo effect which has been extensively studied. Recently I had a patient come in for an adjustment. He stated how he absolutely cannot wear poly lenses. An ECP friend of his confirmed that this was a common phenomenon. He then asked if we could duplicate his lens as he has never been so happy with glasses as he has been with these. Turns out they were poly!! He was a little dumbfounded! The point of all this is that the parameters and variables involved in why a patient rejects or accepts their eye wear are numerous and multifaceted. Vague catch all terms like “poly non-adapt” have become mental shortcuts for when an ECP needs an explanation but lacks the knowledge or comprehension of what other variables might be in play. Poly non-adapt should be replaced with abbe sensitivity within the eye care community.
Also Andrew, I applaud the fact that you realize that other variables are in play and haven’t adopted the dogmatic position many ECPs take by simply stating poly is the problem and that’s the end of it
why you can see the rainbow in the lens? here is the reason: before lenses under the anti-glare coating room, the lenses should be immersed in the hard coating liquid. 1.5 index lens should use 1.5 index hard coating liquid, 1.59 poly lens should use 1.59 index hard coating liquid. if you make 1.5 index lens with 1.59 index hard coat liquid, it will cause rainbow problem.
great work great explanation
That three part series are among my favorites we have ever done. Not pure optician stuff but I sure did learn some new things! Including that what we were taught all those years ago was wrong.
Great video
When I wear polycarbonate Rx lenses, I am able to pickup the chromatic aberration. So I always get CR-39. I recently got a pair of Polycarbonate Transitions Xtractive Grey lens with a blue flash mirror and I could not pickup the chromatic aberration. Why?
That combo means a lot less light getting through! A LOT LESS LIGHT so less of a chance to catch the aberration. Did they get a back-side AR as well? That would be another reason.
@@LaramyKOptical Yes! It has a backside AR.
@@Enemji So you have a trifecta of reasons why!
I did a high power reader and specified an oc in poly for a woman who insisted on a large frame. She experienced photocromatic. Was the abbe principal in play here?
Absolutely.
Hi
You explain very well
I had to get technical knowledge about stock lens casting which is made from mold.
for example
R - 3.00 sph - 200 cyl is made from mold, then how do I select mold?
Are you saying you are creating your own lens molds? Whoa! I guess I would find a lap tool series and work with them as the "negative" of the concave molds. You have to have someplace to start. Then it's the nominal lens formula corrected for material and sometimes thickness.
If you have a mold series I guess you would clock the two surfaces, correct for index and use the nominal lens formula?
There has to be a chart or software of some kind that would go with the molds.
@@LaramyKOptical sir
If there is a video link related to D1 base, then give me
I saw on Reddit that myopic powers weaker than - 2.0 has low risk of lenses causing chromic abberation. Does that sound reasonable?
Yeah. Any lens less than 2D isn't prone to much of anything.
@@LaramyKOptical Thanks! Btw I appreciate how you even tried reading physics whitepapers for this video, extreme dedication
@@LaramyKOptical I have -2 and -1 astigmatism, and I can see huge cromatic abberation, and also if I look slightly off the lens' center everything is blurry... before these new glasses I had one that had only -1.5 of myopia and it wasn't noticible, but now it is, is this change the cause or could be a defect or something? should I get them redone with a different refraction index?
@@Gadottinho Going from a sphere of 1.50 to a lens with sphere and 2 and 1 of cylinder is going to change things. BUT - something doesn't sound right. You should have at least 15mm of clear vision around the center of the lens with eye movement. (much more in most cases) You should never experience "huge" chromatic aberration. Sounds like maybe multiple problems and I suggest trying another shop and starting over.
Does abbe value matter in tinted lenses or powered sunglasses??
No.
Would you please explain more??
@@MehrOptic I'm really not sure what the question is? Since you are reducing the amount of light entering the lens by tinting it the lens will be far less prone to any issues with Abbe. Abbe is related to material and materials respond in different ways to tinting - that is covered in other videos. But that isn't the same thing as Abbe having an affect. Sorry but I can't really see anything related to tints - sunglasses - power and Abbe. Of course I may be missing something! John
@@LaramyKOptical dear john
You’re as a teacher to me
I watch your videos times and times
And I really learn many things from you
You are my teacher and you inspire me i hope that one day i become an optician like you 😍😍
@@LaramyKOptical my question is:
If we tint a lens, the abbe value will change or not??
And is it necessary to use a high abbe value lens for tinting?
Thats whay I'm not pick poly if I can! (also, the lens is made, in it's principal unity, for two prism)
1.67 and 1.74 are equally poor with having abbe values of 31 and 32.
Hi Bernardo What material buy for your lens?
@@donnmccarthy8710 there are 1.6 and 1.7 with abbe value of 42 and 36 respectively, 1.6 is almost the same as poly but with a quite higher abbe value
These are very interesting Utube...
How much abbe value of glass please?