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Have you ever had any issues with sore eyes or itching or anything like that and it turned out to be because you had the wrong cleaning solution?
Would you mind telling us about it? Thanks. |
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Aviod solutions containing "Biguanides" as the disinfecting agent. This compound tends to bind proteins in your tears to high silicon/water content contact lenses
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So what are the symptoms of protein buildup on your contact lenses? Burning and itching like I mentioned before? |
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biguanides dont bind protein to tears, where did you get that misinformation?
![]() Last edited by rfriel; 01-22-2010 at 10:40 AM.. Reason: spelling |
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It said: Biguanides tend to bind the protein IN YOUR tears to high Silicone/Water Content lenses, not bind protein to the tears. (I don't know if this is true, just correcting your reference to the earlier post). knotlob |
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F**** REFERENCE!!! or just cause I said so?? yeah, whatever.....
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Hey, be nice to Knotlob. He knows what he's talking about. What's with you anyway? Are you here just to make trouble? Can't we all just get along?
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the doc said so, that's the golden word to be believed above all else, should we bow down to the doc??Last edited by rfriel; 01-22-2010 at 12:24 PM.. Reason: fdsfads |
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I had not heard that before, but I am told that for RGP lenses (in my case Menicon Z Alpha) I must intensively clean the lenses weekly. The routine sterilising compound recommended for day to day use, uses Biguanide as the active ingredient, though I think I would prefer the more thorough two step peroxide for 100% disinfection. But I cannot switch until I have discussed that with Menicon. Of course RGP lenses use an entirely different silicone polymer to that used in the soft lenses. knotlob |
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Why are you so upset, rfriel? Nobody's trying to pick on you. Why do you have to be like that?
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If that's not "upset" then I'd hate to see how you react when you really do get upset . . . Now, what is this about a reference again? |
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What on Earth does this have to do with contact lenses? |
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VirginiaEyeDoctor believes the Biguanide based system binds to high water content and/or silicone hydrogel lens structures (which would make deposit build up worse). knotlob |
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You sound as though you don't necessarily agree. Biguanides or not, do you think that silicone hydrogel contact lenses have a particular problem with build-up?
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I have to take VirginaEyeDoctor's word for the time being. However, I accept his/her statement as I think I have seen words to that effect elsewhere, but would prefer to see the academic backup. I don't really like to use a Biguanide type cleaning/disinfection system as it just isn't as effective at destroying more persistent microbiological agents. I use a two part peroxide for that reason. I also find that the biguanide system I was recommended to use for RGP lenses seems to create grit from dried solution products, which is very uncomfortable in my eyes. knotlob |
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That sounds like the opposite of cleaning to me. Seems like the effect of biguanides is to make sure the proteins never come off.
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knotlob |
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Something like that? |
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I understand that silicone hydrogel (SiH) lenses are less prone to protein deposits than conventional hydrogel lenses. I prefer hydroxide cleaning systems, but realise Multi Purpose Cleaning Disinfection systems are probably more convenient to the average contact lens wearer. But as VirginiaEyeDr says, it will depend to some extent on the individual's tear chemistry. knotlob |
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knotlob |
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I now wear RGP lenses and didn't like the Multi Purpose Solution I was recommended to use, so eventually got the manufacturer's agreement to use a two step peroxide system for these too. That worked fine for cleaning. However, after a few days, the RGP lenses become a bit uncomfortable and so I had to use a RGP soaking/wetting solution after the peroxide. I subsequently switched to another Multi Purpose Cleaning Solution but will search for others to try as well. So, in summary, peroxide very good for soft lenses, not very good/comfortable without a soaking solution for RGP lenses. knotlob |
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If biguanides are bad for contact lenses, why do they put them in cleaning solutions?
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Probably convenience also. You don't need to wait for the disinfecting solution to be neutralised like peroxides. You can put the Multi Purpose Cleaning/Disinfecting Solution directly into your eye.
knotlob |
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So which contact lenses have this "high silicon/water content"? Would they all be a certain type, like monthly disposable? What about Biofinity?
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Anyway, how can something be both high silicone and high water content? Isn't that what you mean, VirginiaEyeDr, when you said "[Biguanide] tends to bind proteins in your tears to high silicon/water content contact lenses"? |
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There is nothing wrong with Dymed type solutions when using HEMA lenses, although I've always recommended peroxide. However, each material is different. The only solutions specifically recommended for use with silicone gel lenses are 1) Alcon Replenish, 2) AMO Complete and 3) peroxide systems.
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From post #18: "The 'biguanide' I refer to is polyaminopropyl biguanide (DYMED) and is used in Multi Purpose Disinfecting & Cleaning Solutions." So it's an ingredient in contact lens multi-purpose solution.
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Thanks for pulling it all together, Juicer.
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