Inside Out Acuvue

Momalina2 · #1 (**permalink**) 05-22-2008, 03:34 PM

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.

ebonyeyez · #2 (**permalink**) 05-27-2008, 04:59 PM

just put it on your finger tip and figure which side goes up...simple as that

MillersLastChance · #3 (**permalink**) 07-16-2008, 02:43 PM

Quote:

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?

just put it on your finger tip and figure which side goes up...simple as that

Q: How can I tell if my contact lens is inside out?

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?

321contacts · #4 (**permalink**) 07-18-2008, 10:49 AM

Quote:

Originally Posted by MillersLastChance

Q: How can I tell if my contact lens is inside out?

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?

That's cute.

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?

duncan08 · #5 (**permalink**) 12-15-2008, 10:39 PM

If your contact is right side up, when you bend it the contact will fold up like a taco. I have been wearing contacts for close to 20 years and have always used the taco method and never have a problem!

Momalina2 · #6 (**permalink**) 06-04-2009, 02:34 PM

Quote:

Originally Posted by duncan08

If your contact is right side up, when you bend it the contact will fold up like a taco.

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?

andria · #7 (**permalink**) 08-26-2009, 05:33 AM

is there any way to find my acuvue inside or outside

Momalina2 · #8 (**permalink**) 09-10-2009, 04:23 PM

Quote:

Originally Posted by andria

is there any way to find my acuvue inside or outside

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?

T. Arthur · #9 (**permalink**) 11-05-2009, 09:36 PM

Quote:

Originally Posted by andria

is there any way to find my acuvue inside or outside

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.

MillersLastChance · #10 (**permalink**) 11-19-2009, 10:55 AM

Quote:

Originally Posted by 321contacts

That's cute.

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?

Like this?

T. Arthur · #11 (**permalink**) 11-19-2009, 03:14 PM

Quote:

Originally Posted by MillersLastChance

Like this?

[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 ?

Hogwartz · #12 (**permalink**) 11-19-2009, 04:33 PM

Quote:

Originally Posted by T. Arthur

[T. Arthur]
You still haven't answered my question.... which Acuvue type is equivalent to Biomedics 55 ?

Well, I'm not an expert, but I'll do my best.

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.

T. Arthur · #13 (**permalink**) 11-19-2009, 10:08 PM

Quote:

Originally Posted by Hogwartz

Well, I'm not an expert, but I'll do my best.

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.

[T. Arthur]
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

R2D2 · #14 (**permalink**) 11-20-2009, 09:47 AM

Quote:

Originally Posted by T. Arthur

[T. Arthur]
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

Let us know if you try the Acuvue 2 contact lenses, okay?

Knotlob · #15 (**permalink**) 11-27-2009, 03:42 PM

Quote:

Originally Posted by Hogwartz

Well, I'm not an expert, but I'll do my best.

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.

Here is a table of some of the contact lens materials:

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

Knotlob · #16 (**permalink**) 11-28-2009, 10:34 AM

Quote:

Originally Posted by T. Arthur

[T. Arthur]
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

I think this 4 way classification of lens types is designed to make testing of new lens solutions easier. i.e. a new lens solution need only be tested on one lens from each of the 4 categories to seek approval. It does not mean the lenses within a given category are similar in properties.

knotlob

R2D2 · #17 (**permalink**) 01-21-2010, 01:39 PM

Quote:

Originally Posted by T. Arthur

[T. Arthur]
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

Were you able to make the switch to Acuvue, T. Arthur? What do you think?

Goldar · #18 (**permalink**) 02-25-2010, 03:28 PM

Quote:

Originally Posted by T. Arthur

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.

I found a website for these Lensvue gizmos, and here's a picture of what I believe to be an Acuvue lens taken through the Lensvue 2 device. Here it is: