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I just heard about the 1-Day Acuvue Moist contact lenses. Are they something new? I was wondering if someone could tell me how these contacts compare to Focus Dailies as far as comfort, price and ease of handling. Thank you.
Last edited by yournamehere; 10-13-2009 at 04:41 PM.. |
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1 Day Acuvue Moist has been around for about a year. They actually work better than the ciba dailies. Ciba Dailies are smaller and thinner than the Acuvue contacts, so if yor presently wear the dailies, then you might not like the Acuvue contacts. But later this year, Ciba is releasing Dailies with Aquarelease plus, which will feature more moisturizing effects. This will be a premium alternative to the Dailies, so both contacts will be offered. Release date is tentatively this spring. It is available now in Canada.
Last edited by Lens 101 - Administrator; 10-15-2009 at 08:46 AM.. |
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Dailies AquaComfort Plus 90PK Focus Dailies 90PK Focus Dailies Progressives 30PK Focus Dailies Toric FreshLook One-Day (Focus Dailies SoftColors). Are any of these the "Ciba Dailies" you mentioned being released sometime after February of 2008? |
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It's the Dailies AquaComfort Plus. They have 40% more moisturizier and 3 lubricants rather than just one, compared to the Focus Dailies. Unfortunately, it is also a slightly bigger and thicker lens, too. So you would have to experience the lens on your eye to see if it is acceptable.
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Thanks for your help, eyebike1. That was a pretty good review you wrote there. Keep up the good work. There are plenty more questions about 1 Day Acuvue Moist that you can probably answer.
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Yes, thank you for the information. When you say "different size" do you mean base curve and diameter? Don't most contact lenses come in a range of sizes?
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Unfortunately, many contacts only come in one diameter and one curvature, the base curve, usually a medium. Which is fine if your eye close to normal dimensions. So a few contacts, usually the spherical lenses, do come 2 curvatures. One pre-disposable era lens, Cibasoft, came in 6 combinations of sizes, 2 diameters and 3 base curves.
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No, most people are not the same size. Contacts can fit a range of different eye shapes and sizes, but not everyone. That's why it helps to have multiple parameters and even other brands of contacts available. Even different brands of contacts fit differently.
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Hi Eyebike. I have a follow-up question to K-9's post. If eyes can vary so widely in size and shape, why do some contact lenses only come in or or two sizes? Wouldn't it make sense, from a marketing point of view as well as for eye health, to offer as many sizes as possible?
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Because of the cost of doing business and maintaining inventory, the manufacturers will do things to get the biggest return for the smallest expense. Why spend a lot more to fit a small portion of the market? A lot of shoes are only made in medium too, although I personally need a wide. Rules out a lot of shoes for me.
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I wonder what the most common base curve and diameter of contact lenses is? I bet that's the one size everybody sells. |
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I think soft contact lenses are pretty tolerant of fit - OK they won't fit everyone, but I am being fitted for RGP lenses at present and was told I have pretty flat corneas - news to me, as I am happy with the common sized soft contact lenses (BC 8.4-8.6mm). knotlob |
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Is it okay to wear contacts that are a little different? Can you wear, say an 8.2 base curve if you can't find your proper 8.4? How wide of a tolerance is there? Is it the same, bigger or smaller? |
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There was a poster here a couple of weeks ago who had a very steep (short radius) BC and had some problems, but eventually went for a size bigger/flatter and I think found them OK. The BC fitting/suitability is going to be assessed by the optician to ensure the lenses are able to float/move just enough and not too much. If they are too tight, they will cause problems and if too loose, may fall out/go off centre/constant refocussing as you blink? But that is probably only going to affect the few unfortunate people whose eyes are outside the norms in Base Curve, etc. I don't think I had the radius of my eyes measured until a week ago when ordering RGP lenses. RGP lenses are quite the opposite and must be fitted exactly - the BC fit can be tuned to correct a small amount of astigmatism, but of course RGP lenses are usually customised. knotlob |
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As I said in an earlier post, I have been told I have relatively flat corneas. My optician defined Flat as being 8.0mm and Steep as being 7.4mm. The optician measures each eye in the horizontal radius and vertical radius for the RGP lenses and then averages the two readings for that eye. So in my case, I have an average corneal radius of 8.08mm and 8.06mm right and left eyes respectively. The actual prescribed RGP lenses are slightly flatter at 8.25mm and 8.20mm, I think to correct my slight astigmatism with a thicker tear film under the lenses. Now I am not sure what the relationship between measured corneal radius and soft lens base curve, since soft contact lenses are normally 8.4 - 8.6mm base curve (which is even flatter than my relatively flat corneas). However, you can see I am at the fairly extreme end of the flat cornea range but can wear 8.4 or 8.6mm base curve soft lenses without any problem. So that confirms the wide tolerance of fit on soft contact lenses. I will try and find out more about the relationship between measured corneal radius and soft lens base curve on my follow up RGP lens check. knotlob |
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You do use keratometer (curvature) readings of the eye as a base to start when selecting a lens. Other factors that matter are the size of the cornea and the particular characteristics and dimensions of the lens you are working with. Some lens companies like Ciba Vision try to take a one size fits all approach, since many of their contacts do come in one base curve. However, sadly, they do not fit everyone. Vistakon's (Acuvue) pretty much come in 2 sizes and base curves, except their multifocal and toric lenses. So their lenses do fit more people. Tne negative here--higher cost of doing business and maintaining inventory. Another example, even though both the 8.3/14.0 Advance and Acuvue 2 have the same nominal measurements, the 8.3 Acuvue 2 can fit a steeper cornea than the Advance because of the stiffer modulus of the Advance--means it doesn't drape the cornea as well. Even people with same corneas (curvature) but different widths (corneal diameter) may end up needing a different lens.
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knotlob |
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No problem with the RGPs as they are mostly made to measure anyway. It's more a case of adapting to them after the comfort of soft lenses. knotlob |
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I'm sure you'll do fine with those RGPs. Let us know how it's going with you.
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At least they don't itch quite the way that they first did when I got them! I have been dabbling with different lens solution systems and hope to find an optimum one - I think that will be the key. knotlob |
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knotlob |
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