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Medical Forum / General / Vision / December 2005acuvue oasys -- BC other than 8.4??
I currently wear acuvue Advance (BC 8.7, Diameter 14.0) contact lenses. They are very comfortable, my vision is crisp, but they get dry after sitting in front of the computer all day (which unfortunately is part of my job). On the weekends, I have no problem with my contacts getting dry. I really want to try the acuvue oasys, but it seems to be only available with BC of 8.4. Does anybody know when the oasys lens will be available in a BC of 8.7 or 8.8? Also, how critical is the base curve? Would I be wasting my time if I tried to get fitted with the oasys lens (BC of 8.4)? Thanks id imagine base curve is quite important, if its wrong they may be too tight or loose and just not fit on your cornea properly. As for dryness of eyes, thats what contacts do to me, especially from computer. If you can see well enough to use the computer without correction, by all means do so! Otherwise glasses for computer, contacts for anything else to the best of my knowledge no other base curve is planned for AV Oasys. base curve is not very critical for most brands of disposable contact lenses. I would recommend that you try AV Oasys. I am an eye doctor that has recently done some research on Acuvue Oasys lenses. I have also worn them myself. Clinical evaluation from Vistikon has determined that a flatter base curve is not necessary to provide a safe, comfortable fit. Do not let the 8.4 BC scare you. Every CL material and brand behaves different for each patient. If you currently experience symptoms of discomfort at the computer, ask your eye care provider for recommendations for improvement and whether Oasys lenses are appropriate for you. -NBW FWIW, I have no stake in, nor profit from, Acuvue lenses. I agree with what you say within certain limits. However, there are corneas in the steep and flat ends of the spectrum for which steeper and flatter base curves are required for optimum vision and comfort. The one-size-fits-all philosophy certainly simplifies things for the practitioner as well as keeps the costs down for the manufacturer, but ignores the needs of the unusual patient. Every large manufacturer is targeting the central 2/3 of the normal distribution of corneal shape. Certainly lenses like the Acuvue Oasys would seem to fit into some future de-regulated scenario. DrG Dr G and all, Certainly your statement is more accurate than mine regarding fittability of Oasys. The point I was trying (and failing) to make was that if patient the is already in discomfort, there are other options, Oasys being one, and there will only be improvement if the patient lets the doctor know about thier concerns. Then they can work together to find a better contact lens. Thanks. -NBW In addition to what greg said, you also have variance in asphericity, so two 7.8 corneas e=0.2 & e=0.8 will have a different fitting profile with the same lens. One advantage i am seeing with the new SiH lenses is that with less dehydration and more O2 supply, comfort is increasing, even though the fit may not be as loose as we used to like it. I still find that change in base is not necessarily going to resolve the drying in all cases and changing material, design or brand is a better option. grant > I currently wear acuvue Advance (BC 8.7, Diameter 14.0) contact lenses. > They are very comfortable, my vision is crisp, but they get dry after > sitting in front of the > computer all day (which unfortunately is part of my job). On the > weekends, I have no problem > with my contacts getting dry. I don't know your situation, but I had problems with dryness at work. When I had a little cold, it would invariably get much worse at work, due to the dryness of the air (I assume). I also was OK on the weekends. I had a contact that just didn't work out. It seemed OK at home, but at work it would dry out, and either pop out or otherwise cause problems. I got a different contact, which worked fine. Still, I put in eye drops at work when it "seemed dry". If plain old saline drops aren't doing it, there are drops that last longer (and cost more). In the US, they are available at any store with a reasonable selection of eye products.  SignatureDan Abel dabel@sonic.net Petaluma, California, USA Thanks, I appreciate all the replies. Since I am currently wearing acuvue Advance (BC 8.7), then if I tried the Oasys (BC 8.4), the fit would be tighter, is this correct? What are the advantages/disadvantages of a tighter fit? Is there any coorelation between tight fit and contacts getting dry? The main reason I am interested in trying the acuvue oasys is that acuvue's website states that the oasys has "reduced contact lens related dryness". I only experience contact lens dryness at work (mainly after 4 or 5 hours), as I sit in front of a computer all day. > Since I am currently wearing acuvue Advance (BC 8.7), then if I tried > the Oasys (BC 8.4), the fit would be tighter, is this correct? Yes. > What are the advantages/disadvantages of a tighter fit? Better comfort and less "dryness," unless they're too tight. > Is there any coorelation between tight fit and contacts getting dry? No. _Loose_ lenses feel dry. > The main reason I am interested in trying the acuvue oasys is that > acuvue's website states that the oasys has "reduced contact lens > related dryness". I only experience contact lens dryness at work > (mainly after 4 or 5 hours), as I sit in front of a computer all day. "Dry" sensation often improves with a tighter fit. The Acuvue Advance also has different surface characteristics.. it's more slippery so sometimes it moves more and tighter fits are appropriate. The company says 8.3 will fit most people. -MT Tight lenses feel dry because they don't moove and you get no tear exchange, so focal areas of dryness occur and this dehydrates the cornea. Looser lenses provide better tear movement so better wetting of the posterior surface of the lens. With SiH lenses, drying is less, so you don't have the issues with focal drying as you get with regular hydrogels. Try Ciba O2Optix lenses, they work pretty well also and are great for dry eyes. dr grant > but they get dry after > sitting in front of the > computer all day (which unfortunately is part of my job). On the > weekends, I have no problem > with my contacts getting dry. This post is peripheral to your main question, but I (although definitely not an expert) don't see how sitting in front of a computer can make your contacts more dry. What is most likely the case, is that the room at work where you sit in front of that computer is drier, than wherever you are on weekends. If you have that room at work to yourself, you might try bringing a humidifier there. If there are a couple co-workers you share the room with, you could ask them if they mind your doing so. In fact, it is possible that they also suffer from the overly dry air. If there are hundreds of other workers in the room, then it would be harder to ask them all. ;-) You could ask your supervisor. I could see how looking at a computer screen all day (especially a CRT, I think LCDs are better) could cause eyestrain, but I don't see how it could affect dryness. >> but they get dry after >> sitting in front of the [quoted text clipped - 8 lines] > where you sit in front of that computer is drier, than > wherever you are on weekends. People tend to blink far less often when looking at a PC screen. It is also true that office environments tend to be drier than home environments. -Quick > > but they get dry after > > sitting in front of the [quoted text clipped - 7 lines] > where you sit in front of that computer is drier, than wherever you are on > weekends. Been there, done that. Using a computer does in fact dry out the eyes. People stare too hard, and forget to blink. Of course, if they follow the standard advice to look away every few minutes, and remember to blink, then they don't have as much of a problem. You are correct, though, in that many office environments have air that is too dry. I used to try to work when I was sick. This was a disaster. After way too many ear infections, I learned that when I was sick, I needed to stay home, or I would be off work even longer. I also noticed that contacts that worked OK on the weekends didn't function at work. I switched contacts, and tried to remember to put in eye drops periodically. I got special eye drops, which I really didn't need at home. SignatureDan Abel dabel@sonic.net Petaluma, California, USA Besides the decreased blink rate while working on a computer, we tend to open our eyes a bit wider exposing more ocular surface . >> > but they get dry after >> > sitting in front of the [quoted text clipped - 22 lines] > periodically. I got special eye drops, which I really didn't need at > home. |
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