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Is there a really easy way to tell if your Acuvue contacts are inside out? That "bowl" thing seems to really confuse people. Does anyone have a better way?
How about a picture that illustrates this "bowl" principle. That's when I finally understood it--when I saw a picture. |
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A: Look at it and see if it's inside out. Simple as that. I think Momalina2 is looking for something a little more specific, don't you? ![]() |
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It's hard to describe verbally, but if you look at a contact lens sitting on the tip of your finger and it's a simple semi-circle, kind of like the letter "c" (for contacts ) you've got it right.However, if it's inside out, the rim of the lens will flare out and form a kind of "lip" all around. See how hard that is to describe without pictures? |
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What if it's not "right side up" (or "outside out", as opposed to "inside out" as the case may be)? What will happen if you bend one that's inside out? Will it pop out from between your finger and thumb?
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Are you re-staring this thread, andria? I'm guessing that by "inside or outside" you mean "inside out or not." Do I have it correct?
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Of course there is. Don't listen to "taco testers". Acuvue like MOST modern lenses are "INVERSION MARKED" with tiny microscopic letters. You need to buy a LENSVU2 viewer which is just a small plastic viewer the size of a thimble and you place the lens on it and lok thru it towards the light. If you see the letters forward, it is rightsideout, if the letters read BACKWARDS then the lens is insideout. Look up LENSVIEW2 which can be ordered online for a few dollars (I got mine on ebay). Note... SOME lenses are not inversion-marked (Biomedics for instance) but most of them are. Last edited by Lens 101 - Administrator; 11-30-2009 at 03:38 PM.. Reason: Language |
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[T. Arthur]
Yes but the difference is very slight... in fact I'm using that method with my Biomedics55 because the things aren't inversion marked... problem is I have to use a jewler's lupe to look at the edge under high magnification to see the difference. Inversion Marking is DEFINITELY preferable, and most other lens brands ARE "inversion marked". You still haven't answered my question.... which Acuvue type is equivalent to Biomedics55 ? Last edited by Lens 101 - Administrator; 11-19-2009 at 05:15 PM.. Reason: Language |
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I went to lens.com and looked at the composition of Biomedics 55. They're made of 45% ocufilcon D and 55% water. Acuvue makes four kinds of lenses, and of those four, two are 58% water, the rest have less. Acuvue and Acuvue 2 are both 42% etafilcon A. How similar is etafilcon A to ocufilcon D? I don't know, but there are the numbers for you. I'm sorry I wasn't able to answer your question, but I hope I've narrowed it down for you. |
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Thanksd for the tip on water content. This site: http://www.aclens.com/lens-materials.asp Contact Lens Materials & Water Content tells us there are only 4 catagories: hi-lo water content ionic vs. nonionic water It says that Biomedics55, Acuvue and Acuvue2 are in the same catagory- "high water content - ionic" So my guess is I can wear Acuvue or Acuvue2 if I'm already wearing Biomedics55 Acuvues of course ARE "inversion marked" wheras Biomedics aren't, which is THE problem I'm trying to solve! Thanks |
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http://hamerlik.com/lens/contact_lenses_permeability.html You can see that the J&J Acuvue etafilcon A has a Dk oxygen permeability value of 28 and water content of 58%, whereas the Biomedics 55 ocufilcon D has a Dk value of 19.7 and water content 55%, so there is quite a difference in oxygen permeability between the two materials. Interesting site on contact materials posted by T Arthur. knotlob |
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knotlob |
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Woah. That's pretty cool. With a tool like that, the inversion mark is hard to miss.
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Here ya go. |
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knotlob |
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You bought one of those Lensvue things? What kind of contacts do you wear? Are they Acuvue? It would be cool to pair the Acuvue with the Lensvue, wouldn't it?
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knotlob Last edited by Knotlob; 05-27-2010 at 05:36 PM.. Reason: Spelling |
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You just bought your what on line? Contact lenses or the Lensvue gadget?
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THANKS for the post with all the CAPITAL LETTERS. |
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For those of you who don't know what a jeweler's loupe looks like, here's one that will magnify 30 times. I found this on a site for tools used by the hobbyists among us, and it only costs three US dollars.
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I hope you never become a driving instructor: "Just get in the car and figure out how to drive it. Simple as that." |
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Yeah, no kidding. It doesn't help answer a question to just restate it.
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That thing looks pretty cool. I might have to buy one.
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Awesome! How do you like it? Does it work as advertised?
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It's been about five months since we heard from you 008erica. How's everything going?
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So does it work as advertised?
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So does that mean that Acuvue contact lenses have a 123 inversion mark?
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Did you get your contact lens tool yet, 008erica? I would like to know what your thoughts are.
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I would like to see more product reviews on this website. So anyone who has bought anything like contact lenses or anything related, if you could log in and tell us what you think, that would be awesome. Thanks.
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This is the last we heard from 008erica. I think we've been forgotten.
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Yeah, that happens around here rather often. It's a good thing I don't start developing a complex . . .
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Yeah, Horsluver's right. Maybe 008erica has been busy enjoying life with their contact lenses.
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Another good way to tell if the Acuvue (Oasys) is "right side" out, is to check for the tint.
If the lens appears to be clear, no tint, it's inside out. If the tint is visible, it is in correct position and ready to be placed. |
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Hey, I didn't know that. Where does the tint go?
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Well, I found this on a website that lists the ways to tell if the Acuvue Contact with the tint is in correct position, however from my person observation this is what happens:
You know the edges of the lens which are either turned up toward the eye so as to not cause a lip or ridge, if you have it placed correctly? If you have those edges facing upward on your finger, the edges have a much more concentrated color tint than the rest of the lens, so (to me) it seems to reflect a lot of the tint onto the side of the lens which should be placed against the eye. However, if you have the edges pointing downwards, cause you're viewing it inside out, then you cannot see those edges, and the lens appears clear, by contrast to the other side.. Just try it for yourself (if it's an Acuvue Lens I mean) and you'll see.. It's really great cause I was having a hard time telling with all the different descriptions, such as: conical/taco/fold-up/ and other comparisons... since my lens did all those things in either position.. After using a 30 day lens for a couple of weeks, went back to Acuvue Oasis, and was surprised at how clear and visible the tint was on one side, in contrast to the other brands..... For that reason I like the Oasys, however, it's a thin lens to me, compared to Biofinity, and the Biofinity wasn't hard for me to handle. I did like a thicker lens. The Oasys flips back and forth like a sea creature or something I guess I just need a lot more practice! lol ![]() |
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I am surmising that because the edges of the lens are colored, that when they are facing upward, they cause the tint of the lens to appear darker, more colorful, making lens easily visible in case. And when they are facing downward, and you cannot see the colored edges, making the tint of the lens is almost invisible, (to me). If I can find that website which listed the different ways to make sure an Acuvue lens is "right side out" then I will post a link here, but I won't be able to do a search for a while, since I don't have a lot of computer time, and when I'm online, I prefer this site to others ![]() |
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http://www.articlesnatch.com/Article/How-To-Tell-If-An-Acuvue-Contact-Lens-Is-Inside-Out-/822150 http://www.allaboutvision.com/contacts/faq/inside-out.htm HTH ![]() |
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In other news . . . . If the edges of your contact lenses flare outward when you pinch it . . . . . . you might have inside out contact lenses. If tinted lenses don't seem to be darker on the edges . . . . . . you might have inside out contact lenses. Come on, let's keep this going. |
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Oh, sorry. Wrong bit. |
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If you look at your contact lens from the side and it looks more like a cone than a half circle . . . . you might have inside out contact lenses.
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