Medical Forum / General / Vision / February 2006
quick question: Can i wear contacts almost 24 hours by switching between two?
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Spockie - 14 Feb 2006 05:00 GMT quick question: Can i wear contacts almost 24 hours by switching between two?
WOuld that be better than trying to wear one for 24 hours.
I could switch one pair to another and have like a 10 minute break.
Is that okay?
Or maybe i can switch one to another and have like a 1 hour break?
What do you think.
I am talkin gabout accuvue advance with hydro.
By using two pairs i will switch off and on between two and i will replace two pair every two weeks.
Dom - 14 Feb 2006 10:17 GMT > quick question: Can i wear contacts almost 24 hours by switching between > two? [quoted text clipped - 13 lines] > By using two pairs i will switch off and on between two and i will replace > two pair every two weeks. It's not so much the age of the lens, it's also the hypoxia and the mechanical irritation that is the issue.
So your plan is not recommended.
Dom
LarryDoc - 14 Feb 2006 16:49 GMT > > quick question: Can i wear contacts almost 24 hours by switching between > > two? [quoted text clipped - 13 lines] > > By using two pairs i will switch off and on between two and i will replace > > two pair every two weeks.
> It's not so much the age of the lens, it's also the hypoxia and the > mechanical irritation that is the issue. > > So your plan is not recommended. I agree and will add a couple of comments: The extra handling of the lens actually increases the potential for mechanical irritation, not to mention pathogen contamination. Further, if the Acuvue Advance is not giving you the wearing time and comfort that you need, try a different lens. The Advance lens is not "the latest and greatest." That lens has essentially been replaced by J&J's newer silicone hydrogel Oasys, IMHO (and that of many other practitioners) a far superior lens. There are three (soon to be four) other choices of lens in this technology.
LB, O.D.
Pippa - 14 Feb 2006 19:46 GMT I recently switched from dailies to 02 Optix silicon hydrogels because I was finding the dailies too drying - after 10 hours I was dying to get them out sometimes even before that. Now I'm amazed at the comfort although my optician was a bit concerned that I'd only ever had disposables before - he thought I might find the cleaning an issue. No, these lenses are fantastic!!
>> > quick question: Can i wear contacts almost 24 hours by switching between >> > two? [quoted text clipped - 17 lines] > >LB, O.D. acemanvx@yahoo.com - 14 Feb 2006 22:58 GMT You could wear focus day and night up to a month but its bad for your eyes to sleep in contacts, especially for weeks on end. OrthoK may be what your looking for if you want 24/7 good vision. You do sleep with orthoK but only for 8 hours or so then they come right out and your eyes get a rest and soak up lots of oxygen the rest of the time.
LarryDoc - 15 Feb 2006 02:43 GMT > You could wear focus day and night up to a month but its bad for your > eyes to sleep in contacts, especially for weeks on end. OrthoK may be > what your looking for if you want 24/7 good vision. You do sleep with > orthoK but only for 8 hours or so then they come right out and your > eyes get a rest and soak up lots of oxygen the rest of the time. You are so often so wrong---why do you bother to post here.
1. No one in this discussion mentioned sleeping in lenses, merely being concerned with a day of comfort. You are off topic. No one asked you. Go away.
2. High DK silicone hydrogel lenses have been proven to be safe for overnight use. And if hypoxia (go look it up) is an issue causing discomfort, high DK lenses are a fix. So there.
3. OrthoK does not provide 24/7 sharp vision, at least not for most people. It provides temporary and variable improvement. Some folks enjoy the effect, some don't. Fact. Deal with it.
Why don't you down some of those magic mushrooms of yours and hallucinate clear vision. Back in the kill file you go.
LB, O.D.
acemanvx@yahoo.com - 15 Feb 2006 07:18 GMT no need to be rude! This poster mentioned 24 hour comfort. Normal people sleep more than 8 hours of their lives a day. She only needs to wear contacts less than 16 hours at a time.
There is no such thing as safe overnight contacts. The risks are 10 fold and if you want to argue, take it to my optometrist, hes the expert and hes seen many patients ruin their eyes sleeping in contacts!
OrthoK works great for low myopes and can provide sharp vision for several days between each application of retainer lenses. If you dont perform orthoK, you have no knowlege.
LarryDoc - 15 Feb 2006 16:44 GMT > no need to be rude! This poster mentioned 24 hour comfort. Did not, read it again.
> Normal people sleep more than 8 hours of their lives a day. She only needs to > wear contacts less than 16 hours at a time. Huh? That makes no sense. So, then why did you respond about 24/7 if she's talking about 16 hours. See where I'm going here?
> There is no such thing as safe overnight contacts. The risks are 10 > fold and if you want to argue, take it to my optometrist, hes the > expert and hes seen many patients ruin their eyes sleeping in contacts! I'm sure you've read the studies. Your so very well informed. NOT. The couple of dozen out of hundreds of thousands of wearers that end up "ruining their eyes" are the bozos who continue to wear lenses that obviously hurt, have red, sore eyes, experience blurred/distorted vision, have pain and photophobia and don't seek treatment until it's too late. Injury does not happen without symptoms.
> OrthoK works great for low myopes and can provide sharp vision for > several days between each application of retainer lenses. If you dont > perform orthoK, you have no knowlege. Assumptions, assumptions. Wrong again, ace.
Just stop posting here -- the easiest way for you to get people to stop calling you on your BS. You have WAY too much time. Shouldn't you be doing your homework and studying so that one day you might make it out into the real world?
LB
Quick - 15 Feb 2006 17:31 GMT > Just stop posting here -- the easiest way for you to get > people to stop calling you on your BS. You have WAY too > much time. Shouldn't you be doing your homework and > studying so that one day you might make it out into the > real world? I got the impression that Ace is done with school, basically non-functional and living in his parent's house. He has all the time in the world to look for some attention.
-Quick
CatmanX - 16 Feb 2006 11:28 GMT I like your attitude Larry. Ace is a dangerous moron.
As Maxwell Smart used to say, "It's a pity he didn't use his brain for good and not evil".
grant
Dan Abel - 15 Feb 2006 18:26 GMT > no need to be rude! It's too bad, but sometimes being polite just isn't working, and it's time for RUDE! I think partly it's just your posting style, but you need to be aware that your posting style irritates some people here a whole lot.
> There is no such thing as safe overnight contacts. The risks are 10 > fold and if you want to argue, take it to my optometrist, hes the > expert and hes seen many patients ruin their eyes sleeping in contacts! Let's bring on the dueling ODs!
However, I think it is very rude for you to say which OD is an expert and which is wrong, especially since you aren't an OD yourself.
> OrthoK works great for low myopes and can provide sharp vision for > several days between each application of retainer lenses. If you dont > perform orthoK, you have no knowlege. That's got to be one of the rudest things I've ever seen on this group. And exactly how many orthoK procedures have *you* performed?
You are very, very rude! (Or something). Why don't you understand why others are getting rude in return?
 Signature Dan Abel dabel@sonic.net Petaluma, California, USA
RT - 15 Feb 2006 20:50 GMT > There is no such thing as safe overnight contacts. So, OrthoK corrective devices, which are worn overnight, are not contacts, or are they not safe? Your statement above precludes one or the other.
 Signature ~RT
OsoGrande - 16 Feb 2006 14:31 GMT Patient abuse is the chief cause of people having problems with contacts.
Regarding "no such thing as safe overnight contacts."...have you and your O.D. do some homework on SiH (Silicone Hydrogel) lenses...The brands that are out there, that advertise continuos wear for up to 30 days, aren't just saying it, the FDA has approved it. They all have super high DK/t ratings which relates to Oxygen transmission. The mimimum DK/t for safe daily wear has been established to be 24, most all of the SiH lenses have DK/t well over 100, some approaching 200. Keep in mind high DK/t doesn't always = a good, comfortable contact lens. The biggest challenge with SiH lenses right now is patient comfort. The material they are made of is stiffer, seems to attract deposits more quickly and in general will have some mechanical issues, as far as eyes go.
CatmanX - 16 Feb 2006 11:25 GMT No it's not you moron. The lenses are safe to sleep in.
dr grant
amstel - 15 Feb 2006 19:29 GMT Long answer is NO, short answer is no
Your eyes need the break from the contact lens, you run the risk of severe corneal injury.
acemanvx@yahoo.com - 15 Feb 2006 22:20 GMT "Long answer is NO, short answer is no
Your eyes need the break from the contact lens, you run the risk of severe corneal injury."
I agree with you and my optometrist does as well. Some will deny theres a risk but the simple fact sleeping in contacts increases your risks 10 fold vs. taking them out each night.
RT, orthoK is riskier than regular contacts but safer than overnight contacts. You only wear orthoK a few hours a week while you were overnight contacts a whole week strait without removing them and giving your cornea a break!
CatmanX - 16 Feb 2006 11:34 GMT Yeah, Yeah, yeah you dickhead.Most lenses are pretty safe. OK is extremely safe when used s directed, but there is plenty of evidence that ON SiH wear is as safe as regular daily wear.
The point you have missed here is why does our intrepid wearer want to wear lenses for a longer period? Usually the answer is dehydration or depositing. Both these can be resolved with SiH usage. There is therefore no need to discuss other modalities.
dr grant Yes, he's the guy that actually does fit OK lenses and has so for 14 years. You could probably call him an expert on OK because he knows all there is to know about it.
Dan Abel - 16 Feb 2006 19:02 GMT > Yeah, Yeah, yeah you dickhead. So, who are you calling a dickhead?
I'm sure that several of us will send you instructions on how to "quote". Just ask.
 Signature Dan Abel dabel@sonic.net Petaluma, California, USA
acemanvx@yahoo.com - 16 Feb 2006 21:27 GMT The FDA approved extended wear lenses to be worn for up to 30 days without removal. But researchers later found the incidence of eye infections was greater among people who sleep in their contact lenses. The FDA changed the maximum extended wear period to seven days, but many eyecare practitioners decided that any overnight wear at all is too risky.
The concern is that potentially dangerous organisms, which might enter your eye from your fingers, your eyelids, or the lens care solutions you use, might get lodged under your lens. These organisms can thrive better if your contact lens is not removed nightly, and if the oxygen supply to your eye is reduced because a lens is covering it. This might cause infections that range from an annoying case of conjunctivitis to more serious conditions that can lead to blindness.
The most serious safety concern with any contact lens is related to overnight use. Extended-wear (overnight) contact lenses--rigid or soft--increase the risk of corneal ulcers, infection-caused eruptions on the cornea that can lead to blindness. Symptoms include vision changes, eye redness, eye discomfort or pain, and excessive tearing.
The risk of corneal ulcers for people who keep extended-wear lenses in overnight is 10 to 15 times greater than for those who use daily-wear lenses only while awake, says James Saviola, O.D., chief of the vitreoretinal and extraocular devices branch at FDA's Center for Devices and Radiological Health.
When the eyes are open, he explains, tears carry adequate oxygen to the cornea to keep it healthy. But during sleep, the eye produces fewer tears, causing the cornea to swell. Under the binding down of a rigid contact lens during sleep, the flow of tears and oxygen to the cornea is further reduced. This lack of oxygen leaves the eye vulnerable to infection.
Extended-wear rigid lenses also can cause unexpected, sometimes undesirable, reshaping of the cornea.
Soft extended-wear lenses also bind down on the closed eye, but they are porous and allow some tears through during sleep. Because they have so little form, their binding has little effect on the shape of the eye.
FDA has approved extended-wear lenses for use up to seven days before removal for cleaning. Still, there are risks with use of extended-wear lenses, "even if it's just one night," Saviola says. Daily-wear lenses are removed daily for cleaning and are a safer choice, provided they aren't worn during sleep.
My optometrist knows all that. I am ashamed of any optometrist who is so blantly misguided about the risks of extended overnight contact wear! Just because its FDA approved does NOT make it safe! LASIK has been "FDA approved" but many thousands of people ruin their eyes from laser surgury! If you are too lazy to take 30 seconds to pop out your contacts before you go to bed, you dont deserve to wear contacts! Stick to glassses!
Dr. Leukoma - 16 Feb 2006 12:25 GMT > RT, orthoK is riskier than regular contacts but safer than overnight > contacts. You only wear orthoK a few hours a week while you were > overnight contacts a whole week strait without removing them and giving > your cornea a break! Please cite your sources for that belief.
DrG
acemanvx@yahoo.com - 16 Feb 2006 22:02 GMT The FDA approved extended wear lenses to be worn for up to 30 days without removal. But researchers later found the incidence of eye infections was greater among people who sleep in their contact lenses. The FDA changed the maximum extended wear period to seven days, but many eyecare practitioners decided that any overnight wear at all is too risky.
The concern is that potentially dangerous organisms, which might enter your eye from your fingers, your eyelids, or the lens care solutions you use, might get lodged under your lens. These organisms can thrive better if your contact lens is not removed nightly, and if the oxygen supply to your eye is reduced because a lens is covering it. This might cause infections that range from an annoying case of conjunctivitis to more serious conditions that can lead to blindness.
The most serious safety concern with any contact lens is related to overnight use. Extended-wear (overnight) contact lenses--rigid or soft--increase the risk of corneal ulcers, infection-caused eruptions on the cornea that can lead to blindness. Symptoms include vision changes, eye redness, eye discomfort or pain, and excessive tearing.
The risk of corneal ulcers for people who keep extended-wear lenses in overnight is 10 to 15 times greater than for those who use daily-wear lenses only while awake, says James Saviola, O.D., chief of the vitreoretinal and extraocular devices branch at FDA's Center for Devices and Radiological Health.
When the eyes are open, he explains, tears carry adequate oxygen to the cornea to keep it healthy. But during sleep, the eye produces fewer tears, causing the cornea to swell. Under the binding down of a rigid contact lens during sleep, the flow of tears and oxygen to the cornea is further reduced. This lack of oxygen leaves the eye vulnerable to infection.
Extended-wear rigid lenses also can cause unexpected, sometimes undesirable, reshaping of the cornea.
Soft extended-wear lenses also bind down on the closed eye, but they are porous and allow some tears through during sleep. Because they have so little form, their binding has little effect on the shape of the eye.
FDA has approved extended-wear lenses for use up to seven days before removal for cleaning. Still, there are risks with use of extended-wear lenses, "even if it's just one night," Saviola says. Daily-wear lenses are removed daily for cleaning and are a safer choice, provided they aren't worn during sleep.
My optometrist knows all that. I am ashamed of any optometrist who is so blantly misguided about the risks of extended overnight contact wear! Just because its FDA approved does NOT make it safe! LASIK has been "FDA approved" but many thousands of people ruin their eyes from laser surgury! If you are too lazy to take 30 seconds to pop out your contacts before you go to bed, you dont deserve to wear contacts! Stick to glassses!
p.clarkii@gmail.com - 17 Feb 2006 04:50 GMT this posting highlights a specific problem with you ace. you know just enough information to be dangerous! you surf the web and find documents that are outdated and you take them as gospel.
this document is old-- before the release of silicone hydrogel lenses. some silicone hydrogel lenses are indeed approved by the FDA for 30 day extended wear. they allow sufficient oxygen to supply the cornea so no oxygen deficiency occurs. the rate of infection with extended wear silicone hydrogels is only slightly higher than conventional daily wear, not 10-15 fold.
the poster who started this thread is wearing a brand of silicone hydrogel lenses. your posting is incorrect and invalid. this is but another example of your foolishness.
be gone ace. go to otis' forum. or get a job, quit spending daddy's money, and try your hand at getting a real life.
Dr. Leukoma - 17 Feb 2006 12:48 GMT Ace, like Otis, thrives on the attention of people whose knowledge exceeds his own. Just ignore him.
DrG
acemanvx@yahoo.com - 17 Feb 2006 19:50 GMT I invite both of you to talk to my optometrist. Last year I specifically went to get a pescription for "focus day and night" contacts. My optometrist gasped and said "oh no!" I wouldnt even think of it, its dangerous! I have patients come in all the time with infections and pathalogies. Yes this optometrist was talking about focus day and night being dangerous and this is a new, advanced silcone hydrogel. He said dont sleep in any contacts, period.
Its my optometrist's word against yours. You can say whatever you want vs. whatever my optometrist says. I researched the risks of overnight contacts on the net and my optometrist was right. One ophthamologist even said overnight contacts is as risky as laser surgury over the long term!
acemanvx@yahoo.com - 17 Feb 2006 20:19 GMT Schein's team calls contact lenses "very safe" in general, though they note that contact lenses are associated with some extra risks, compared with eyeglasses.
They rank the risk of vision loss from eye infection for different types of contact lenses:
Lowest risk: Rigid, gas-permeable contact lenses for daily wear Next-to-lowest risk: Soft contact lenses for daily wear Highest risk: Silicone hydrogel contact lenses for extended wear of three-to-four weeks
---------------------------------------------------------------------------------------------
extended-wear hydrogel: NSK, 48.2 and SK, 96.4; and daily-wear hydrogel (excluding daily disposable): NSK, 14.1 and SK, 6.4; -------------------------------------------------- extended-wear silicone hydrogel: NSK, 98.8 and SK, 19.8. daily-wear silicone hydrogel: NSK, 55.9 and SK, 0.0;
You can see that silicone is much safer. If we compare hydrogel vs. hydrogel we see that sleeping in them increases the risks of severe keratitis by about 15 times. The problem is you guys are comparing silicone vs. hydrogel. Thats apples to oranges. I already understand that silicone is safer, period. What im trying to show is sleeping in silicone is infiniately riskier than daily wear. Notice that the rate for severe keratitis is ZERO by NOT sleeping in those silicone lenses!
Wearing contact lenses overnight can increase the risk of keratitis compared with using lenses only during the day. For extended-wear users, silicone hydrogel lenses offer less risk of keratitis compared with hydrogel lenses. The risks however are much higher compared for daily wear.
The rate for severe keratitis when sleeping in hydrogel lenses was 96 per 10,000 wearers per year compared to 20 per 10,000 per year for wearers of silicone hydrogel lenses. These compare to 6.4 wearers per year for daily wear of hydrogel lenses and almost 0 wearers per year for daily wear of silicone hydrogel lenses.
"Individuals tend to make choices based on factors such as comfort, convenience, personal preference, and safety," notes Schein. "The data are solid that the risks are least with rigid and soft daily-wear contact lenses, more with overnight wear of contact lenses and most with refractive surgery," he adds."
I leave this up to the individual. My choice is sticking to glasses and occasional daily wear of contacts. I will never sleep in contacts! Some people are risk takers and gamble their eyes and vision by sleeping in contacts and especially getting RS, namely lasik. I never understood why gamble your eyes sleeping in contacts? It takes me and most people less than a minute to remove one's contacts and put them in the holder before going to bed. It takes only a minute to pour out the old solution, rinse the contacts in new solution, fill the contacts with solution and insert them in the eyes. Its as easy as brushing your teeth! Do you really want to risk your eyes more than neccessary to save a minute of your time? I sure as heck dont! My eyes are far more important than the very, very slight convinence and time saving of inserting/removing contacts. I wear glasses most of the time so I avoid the risks of contacts alltogether!
Dan Abel - 17 Feb 2006 21:22 GMT > I invite both of you to talk to my optometrist. No thanks. Not my job. I certainly won't try to tell an OD how to do their job.
> Last year I > specifically went to get a pescription for "focus day and night" > contacts. I'm no OD, but I can't imagine giving you a pescription for contacts, either.
> even said overnight contacts is as risky as laser surgury over the long > term! I wouldn't recommend surgury, either.
 Signature Dan Abel dabel@sonic.net Petaluma, California, USA
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