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Medical Forum / General / Vision / November 2006what do you think about this CL-Material ?
http://www.benzrd.com/brd/Contactlens_Options.aspx?MaterialNum=7 DK42 at 35°C and high water retention. As contact lens fitters, do you think this is an interesting Material? > http://www.benzrd.com/brd/Contactlens_Options.aspx?MaterialNum=7 > > DK42 at 35°C and high water retention. > > As contact lens fitters, do you think this is an interesting Material? More important to me as a fitter is lens design, range of powers and fitting designs and how well the contact lens manufacturer does with quality control, trial lens supply and support. The Benz material is available from a variety of manufacturers. I use it quite a bit especially for those who deposit the silicone hydrogels. Dr Judy The material Benz G72 has high water content, high oxygen permeability and good resistance to deposits. Further you can have it tailor made, that is any prescription and also toric. It is used to make yearly disposable lenses. Has anyone of you already used the G72 material? I am wondering because it is a new material. If this material gives better oxygen permeability why would you still use G3X or G5X? "eric_8_7_5" <eric_8_5_8@yahoo.it> > Has anyone of you already used the G72 material? I am wondering because > it is a new material. If this material gives better oxygen permeability > why would you still use G3X or G5X? Because oxygen permeability isn't necessarily the most important criterion. -MT > The material Benz G72 has high water content, high oxygen permeability > and good resistance to deposits. Further you can have it tailor made, [quoted text clipped - 4 lines] > it is a new material. If this material gives better oxygen permeability > why would you still use G3X or G5X? In a hydrogel, high water = high rate of evaporation. I cannot see this being a good material for dry eye, and 70% of contact lens wearers have dry eye symptoms. DrG Dr. G. But the difference of this material is that the lens does not dehydrate even if it is high water content. > Dr. G. > > But the difference of this material is that the lens does not dehydrate > even if it is high water content. Says who? Benz? It certainly does dehydrate and I have proof. DrG > But the difference of this material is that the lens does not dehydrate > even if it is high water content. There's more to the material than water content and oxygen permeability. Does it tear? Does it handle? Do germs adhere to it more or less than other materials? There's more to choosing lenses than the material. Who fabricates the lens? How does their design compare with others, for comfort and predictability? Can they supply lenses quickly? Will they give me trial lenses? Must people wait for each trial pair? Any one of these failings can sabotage the best material. It's a competitive market. -MT I just thought that it would be somewhat a revolutionary material for custom made lenses because Benz claims that dehydration is much less than a comparable Material with high water content. Are there any Silicon hydrogel materials which can be tailor made and last for at least 6 months or so? I think there are some people who could benefit from it. > I just thought that it would be somewhat a revolutionary material for > custom made lenses because Benz claims that dehydration is much less [quoted text clipped - 3 lines] > last for at least 6 months or so? I think there are some people who > could benefit from it. Yes, Benz certainly claims that. With all hydrogel materials, the higher the water, the greater the likelihood of dry eye symptoms. This is why silicone-hydrogels work so well. They are low water, and the oxygen permeability is inversely related to the water content. DrG > I just thought that it would be somewhat a revolutionary material for > custom made lenses because Benz claims that dehydration is much less > than a comparable Material with high water content. There is also omafilcon A, a 62% water material that is available in a wide range of parameters. > Are there any Silicon hydrogel materials which can be tailor made and > last for at least 6 months or so? I think there are some people who > could benefit from it. While not available in custom, Acuvue Advance and Purevision are available in torics, with the Acuvue Advance coming in higher cylinder, i.e. -2.75. I was told by a contact lens manufacturer that a silicone-hydrogel material is available for custom manufacture, but I don't have any corroboration for that. Maybe someone else knows. DrG > I was told by a contact lens manufacturer that a silicone-hydrogel > material is available for custom manufacture, but I don't have any > corroboration for that. Maybe someone else knows. The Centre for Contact Lens Research at University of Waterloo is currently enrolling subjects in a study for custom made silicone hydrogel. According to the recruiting info I got, they are looking for high plus, high minus, high toric patients. http://cclr.uwaterloo.ca/Public/Participants/Current%20Studies/CL%20Wearers/CLWe arers.html >> I was told by a contact lens manufacturer that a silicone-hydrogel >> material is available for custom manufacture, but I don't have any [quoted text clipped - 6 lines] > > http://cclr.uwaterloo.ca/Public/Participants/Current%20Studies/CL%20Wearers/CLWe arers.html Rats, I guess Southern Californians don't qualify...  SignatureCheers. Bev ========================================================== It's not true that Lucas, in 1947, tried to get Parliament to repeal Ohm's Law. They withdrew their efforts when they met too much resistance. > http://www.benzrd.com/brd/Contactlens_Options.aspx?MaterialNum=7 > > DK42 at 35°C and high water retention. > > As contact lens fitters, do you think this is an interesting Material? The ideal material would have the low water content and oxygen permeability of silicone-hydrogels, with the surface chemistry of the Omafilcon A (Proclear), i.e. the ability to attract molecules of water to many binding sites and repel lipids and proteins. DrG In know that there is a silicon hydrogel with 0 water content. It is used to make RGP-lenses which last about 6 months. It is called onsifocon A ( http://www.lagado.net/ ). Do you think there are technical problems to make Silicon hydrogel Pellets or is it just a commercial choice? High oxygen is available for custom made RGPs but not for custom made soft lenses. There are persons with over 20 Diopters of Myopia (or very high hyperopia such as +13) who have to wear high water content soft lenses because they do not tollerate RGPs. I think they would be really helped by silicon hydrogels. |
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