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Medical Forum / General / Vision / April 2006Purevision Multifocals?
Are they available yet? (I see them advertised online already, at: http://www.aclens.com/displaylens.asp?LensID=290 I know that online ads can be deceptive though--advertising something not in stock yet.) Has anyone reading this had any experience with them yet, either as patient or prescriber? If so, please describe how well they have worked for you or your patients. Thank you. i have been using them for approximately 1 month (both as a doctor and as a sporadic wearer). i think they have a similar design to the soflens multifocal, although, like the torics, their diameter is 14mm rather than 14.5mm. they come in both 'low' and "high" bifocal powers. personally i have many multifocal patients who are interested in extended wear so i like these contacts and will probably use them a fair amount. comfort is OK (not as good as AV Oasys IMHO) and the optics are typical of a multifocal. Yeah, yeah, yeah, but Oasys is an upgrade on Advance. PureVision has an upgrade coming out sometime and I hope that will be better. The soflens 66 MF was a pretty good design but crappy material. Hopefully, the better material should fix things. It is not yet commercially available from what I am told but will be soon. dr grant > The soflens 66 MF was a pretty good design but crappy material. > Hopefully, the better material should fix things. soflens multifocal is not the 66 material but is polymacon (38%). i think polymacon is underrated as a material. it is quite comfortable for many people, quite durable, and doesn't get dirty quickly like many other plastics. however, it sucks for EW. > It is not yet commercially available from what I am told but will be > soon. well i have been ordering it in trials for over a month. in all powers. except for the EW aspect of the material i don't see much difference over the SL multifocals. i was not aware that an upgraded Purevision material is on the way. i look forward to it. anyone heard of SiHy lenses coming from Ocular Sciences/Cooper anytime soon? Cooper has more faith in their PCh material (Proclear) and they spend a lot of time trash-talking anout any silicone hydrogel. The CooperVision XC ("Extended Comfort") is an aspheric soft lens that takes the Proclear technology "toe to toe" with Oasys and Purevision. I've only fit a few so far, but patients seem to love it. > Cooper has more faith in their PCh material (Proclear) and they spend > a lot of time trash-talking anout any silicone hydrogel. The > CooperVision XC ("Extended Comfort") is an aspheric soft lens that > takes the Proclear technology "toe to toe" with Oasys and Purevision. > I've only fit a few so far, but patients seem to love it. Well, omafilcon, hioxifilcon, and similar will deliver perhaps 90-95% of the corneal oxygen needs.for a daily wear modality. EW is a different game altogether. It will be interesting to see how Coopers change their stance once their Biofinity silicone lens is launched into the US (Dk = 128) You can bet they will bring the proclear MF out in Biofinity pretty soon as long as the material shows any promise. dr grant The Biofinity looks to be the silicone hydrogel OSI were developing prior to them being acquired by CVI. Doesnt look like a sniff of PC anywhere in it according to the 510k summary > You can bet they will bring the proclear MF out in Biofinity pretty > soon as long as the material shows any promise. > > dr grant Yes, it is the OSI material. The question is whether it will perform as well or better than Proclear and the SiH lenses currently available. grant The Purevision Multifocal behaves much better than the old 66 percent hema crap that the original multifocal comes in. The larger diameter and 8.7 BC are based on the premise that the two base curves of the old hema aren't needed anymore as the new uniparameter silicone hydrogel has a "modulus" aka stiffness that allows more of a rigid lens relationship with the cornea than the old "suction cup" fit of the 66. Maybe. Uniparameter has always meant "its cheaper to make this way" in my book. 1. Purevision Multifocal: Became available here last month. I wear it and have dispensed them to patients. IMHO, best mulitfocal soft lens out there thusfar. Optics are superior to similar designs in HEMMA plastics. 2. Coopervision plans to release their Biofinity silicone lens in spheres and torics to practitioners mid June with patient lenses available end of June or beginning of July. 3. Polymacon may be a durable, deposit resistant material, but it also has the lowest oxygen permeability of any commonly used soft lens material. IMHO, this circa 1972 material has NO place in modern contact lenses. At all. Period. 4. Coopervision's omafilcon (Proclear) material, now being used across their product line is a great plastic for patients with dry-ish eyes and has one of the best oxygen transmission profiles of the non-silicone soft lenses. That material, and the hioxifilcon plastic represent the best of the current generation (not counting silicone hydrogels) lenses. I think Coopervision is positioning itself appropriately for the contact lens market in 2006. Finally. note: I have no financial interest (except perhaps in mutual funds) in the mentioned companies. LB, O.D. > 3. Polymacon may be a durable, deposit resistant material, but it also > has the lowest oxygen permeability of any commonly used soft lens > material. IMHO, this circa 1972 material has NO place in modern contact > lenses. At all. Period. i hear you. its not my favorite either, but if you don't overwear them they work fine! no need to have the highest spec'd Dk material if the patient takes their lenses out after 12 hours. i have lots of patients who LOVE polymacon and don't like SiHy lenses. and since they don't abuse the lenses and their corneas are healthy why should i protest? and why should you protest? at all? period? ;) |
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