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Medical Forum / General / Vision / January 2006Remove the anti reflection coating?
I have a strong prescription with the greenish reflecting coating. I guess it is either Ziess or Hoya that is applied to the plastic lens. For some reason, after time, I get very fine scratches on the back curved side of the lens near the center. I'm getting new glasses anyway so I wonder if there is a chemical available I could strip off the damaged coating without affecting the rest of a lens. I'd consider this an experiment so I won't be too upset if I damage the lens. Thanks -S > I have a strong prescription with the greenish reflecting coating. I guess > it is either Ziess or Hoya that is applied to the plastic lens. For some [quoted text clipped - 6 lines] > Thanks > -S My optician offered to scrape off the anti-reflective coating from my last pair of glasses so I know it can be done, but I don't know how. I decided to leave it alone although it annoys me. Are you sure the scratch is just in the coating, though? -Gudrun >I know it can be done, but I don't know how. I asked my opt. about that once - he said that it is a coating that is bonded to the lens at a molecular level at the time the lens is created. It can't be removed, can't be replaced (without wrecking the lens). For me, putting the words 'scrape' and 'lens' in the same sentence is just begging for trouble. > I asked my opt. about that once - he said that it is a coating that is > bonded to the lens at a molecular level at the time > the lens is created. It can't be removed, can't be replaced (without > wrecking the lens). I've seen it done several times. It isn't "scraped" off. It's dissolved off using glass-etching compound containing hydrofluoric acid. There's more profit in a new pair of lenses, and so there's little motivation for retailers to take the trouble. -MT On 1/25/06 10:07 AM, in article 1138212446.306783.276720@o13g2000cwo.googlegroups.com, "The Central Scrutinizer" <bobby_dread@hotmail.com> wrote: >> I know it can be done, but I don't know how. > > I asked my opt. about that once - he said that it is a coating that is > bonded to the lens at a molecular level at the time > the lens is created. It can't be removed, can't be replaced (without > wrecking the lens). Don't count on the opt., whatever opt. stands for, for knowing much about coatings. He/she is probably just passing on marketing hype. > For me, putting the words 'scrape' and 'lens' in the same sentence is > just begging for trouble. -- Ferme le Bush > >I know it can be done, but I don't know how. > [quoted text clipped - 5 lines] > For me, putting the words 'scrape' and 'lens' in the same sentence is > just begging for trouble. The less expensive kinds of AR coatings can be removed (and are not worth buying). The AR coatings that sold by the name brand manufacturers (Crizal, Zeiss, Seiko, etc) usually cannot be removed. Mark A schrieb: >>>I know it can be done, but I don't know how. >> [quoted text clipped - 9 lines] > buying). The AR coatings that sold by the name brand manufacturers (Crizal, > Zeiss, Seiko, etc) usually cannot be removed. I agree, by less expensive kinds of AR it is possible to remove. But the newer (much better and expensive) kinds like Zeiss Lotutec etc. would ruin the structure of the optical surface. On 1/26/06 1:51 AM, in article dra62e$3k3$1@news1.nefonline.de, "Christopher Zoettl" <czoettl@kurs.webmasters.de> wrote: > Mark A schrieb: > [quoted text clipped - 15 lines] > the newer (much better and expensive) kinds like Zeiss Lotutec etc. > would ruin the structure of the optical surface. I went for the Crizal. I was amazed about how well the glasses and the coating stood up. Nevertheless, at about 18 month the coating went to pot in a way that reminds me of the One Horse Open Shay. After searching in vain to find a supplier of hot magnesium fluoride antireflection coatings, I gave up. I am now using uncoated lenses. Bill -- Ferme le Bush >I have a strong prescription with the greenish reflecting coating. I guess >it is either Ziess or Hoya that is applied to the plastic lens. For some [quoted text clipped - 6 lines] >Thanks >-S The AR stack (along with the hard coat) can be removed on most materials using chemicals available to the optical industry. Years ago I used Armour Etch, a glass etching creme, to remove lens coatings. Cover both sides for about twenty minutes. Do not use on Poly or glass. Hope this helps, Robert Martellaro ~~~~~~~~~~~~~~~~~~ Optician/Owner Roberts Optical robopt@execpc.com ~~~~~~~~~~~~~~~~~~ "An expert is a person who has made all the mistakes that can be made in a very narrow field." - Niels Bohr >I have a strong prescription with the greenish reflecting coating. I guess >it is either Ziess or Hoya that is applied to the plastic lens. For some [quoted text clipped - 6 lines] > Thanks > -S Okay, thanks for the feedback. It looks like I should leave the coatings alone. For now, I spray a little furniture polish on a cloth and wipe over the area lightly to leave a film of silicone oil. It fills in the fine scratches and makes the lenses nearly clear again. John |
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