No Hole in the DMV Ultra Tool For Durasoft 2 Colors Contact

Guinness · #1 (**permalink**) 06-22-2009, 02:59 PM

That blue thing you see below is called the DMV Ultra (TA-DAAAA!!) It's used to take your used contacts out and put new ones in. In this case, the web site says that this tool does not have something called a "suction hole."

Okay, you can stop giggling now. Don't you think that's rather childish?

The idea of suction is based in a difference in air pressure. In order to create suction, you need an airtight seal. How can you have an airtight seal when you have a hole?

Guinness · #2 (**permalink**) 06-25-2009, 11:52 AM

Anyone? Anyone?

Guinness · #3 (**permalink**) 07-29-2010, 12:29 PM

I'm talking to myself here, people! Help me out.

Frodo · #4 (**permalink**) 07-29-2010, 05:59 PM

Quote:

Originally Posted by Guinness

That blue thing you see below is called the DMV Ultra (TA-DAAAA!!) It's used to take your used contacts out and put new ones in. In this case, the web site says that this tool does not have something called a "suction hole."

Okay, you can stop giggling now. Don't you think that's rather childish?

The idea of suction is based in a difference in air pressure. In order to create suction, you need an airtight seal. How can you have an airtight seal when you have a hole?

OK, I'll join you.

I found an FAQ website for these gizmos. It seems that the "Magic Touch" has a ventilation hole, but not the DMV Ultra.

Knotlob · #5 (**permalink**) 07-29-2010, 08:09 PM

Quote:

Originally Posted by Frodo

OK, I'll join you.

I found an FAQ website for these gizmos. It seems that the "Magic Touch" has a ventilation hole, but not the DMV Ultra.

Just checked the one my son uses. The present one has no suction hole so presumably you wet the end of it and it grips the contact lens by surface tension.

The one he normally uses does have a suction hole and you squeeze the rubber handle and then put in contact with lens, release the suction grip - which forces the lens to stick to the tool and removes said lens from the eye.

The second type works better than the one without the suction hole.

knotlob

Slitheen · #6 (**permalink**) 07-30-2010, 10:49 AM

Quote:

Originally Posted by Knotlob

Just checked the one my son uses. The present one has no suction hole so presumably you wet the end of it and it grips the contact lens by surface tension.

The one he normally uses does have a suction hole and you squeeze the rubber handle and then put in contact with lens, release the suction grip - which forces the lens to stick to the tool and removes said lens from the eye.

The second type works better than the one without the suction hole.

knotlob

So when you want the device to let go of the lens, do you give the handle a gentle squeeze?

Knotlob · #7 (**permalink**) 07-30-2010, 11:59 AM

Quote:

Originally Posted by Slitheen

So when you want the device to let go of the lens, do you give the handle a gentle squeeze?

Yes, that would relieve the vacuum, or just lifting one edge of the RGP lens would probably do the same.

knotlob

OrganicPete · #8 (**permalink**) 07-30-2010, 03:26 PM

Quote:

Originally Posted by Knotlob

Just checked the one my son uses. The present one has no suction hole so presumably you wet the end of it and it grips the contact lens by surface tension.

The one he normally uses does have a suction hole and you squeeze the rubber handle and then put in contact with lens, release the suction grip - which forces the lens to stick to the tool and removes said lens from the eye.

The second type works better than the one without the suction hole.

knotlob

Thanks for the product description, knotlob.

Guinness · #9 (**permalink**) 08-16-2010, 03:47 PM

Quote:

Originally Posted by Knotlob

Just checked the one my son uses. The present one has no suction hole so presumably you wet the end of it and it grips the contact lens by surface tension.

The one he normally uses does have a suction hole and you squeeze the rubber handle and then put in contact with lens, release the suction grip - which forces the lens to stick to the tool and removes said lens from the eye.

The second type works better than the one without the suction hole.

knotlob

Well, that makes sense. Thanks, knotlob.

Frodo · #10 (**permalink**) 09-10-2010, 03:45 PM

Quote:

Originally Posted by Slitheen

So when you want the device to let go of the lens, do you give the handle a gentle squeeze?

If you cover the hole with your finger, you will create a partial vacuum inside, like picking up water with a straw by covering one end.

Too bad I can't use pictures from the Internet to show what I mean.

OrganicPete · #11 (**permalink**) 09-13-2010, 04:13 PM

Quote:

Originally Posted by Frodo

If you cover the hole with your finger, you will create a partial vacuum inside, like picking up water with a straw by covering one end.

Too bad I can't use pictures from the Internet to show what I mean.

I think I know what you mean, Frodo.

If you put a straw into a glass of water then put your finger over the top, air pressure will keep the water in the straw even when you take it out of the glass. Then when you take your finger away, the water falls out of the straw, at which point the straw will still be above the glass, hopefully.