Quote:
Originally Posted by lurker2010
To clarify further, this thread talks about daily disposable lenses. I don't think the TruEye lens sold in the US is suitable for overnight wear. The Dk value isn't as high as most lenses approved for overnight wear. I'm almost 100% sure none of the other daily lenses are suitable for overnight wear.
It's not a matter of marketing or FDA filing. You don't blink when you sleep. Your eye doesn't get enough oxygen. There is a reason why a lens isn't approved for overnight wear.
The few times I fell asleep wearing my lenses, watching TV, I've had to flood my eyes with saline in order to remove the lens. My vision was blurry for a few hours after I removed the lenses.
I used to wear vial lenses. The gold standard of care (US) was the AOSept system. You cleaned your lenses by rubbing them with a few drops of a cleaning product. You rinsed them with saline. You put them in a "cup" with hydrogen peroxide. Once a week you added an enzyme tablet to the cup.
Daily lenses simplify the care. People shouldn't be stretching the wear cycle without making sure the lens care is appropriate.
I'm not disagreeing with Knotlob. Many of the silicon hydorgel lenses are either approved for extended wear or a substantially the same as a lens that's approved for extended wear. Sleeping with such a lens, by accident, may not be the end of the world. Not a bad idea to ask your idea doctor about occasionally sleeping with such a lens. Some people should never sleep with any lens in your eye. Also possible your eye doctor would prescribe a different lens if you think you'll want to sleep in with your lenses occasionally.
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Fair points Lurker 2010
The thread is about 1 Day TruEye but has wandered a little at times as is the norm
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True, the US version of 1 Day TruEye does not have a stellar Dk performance value and I don't think it's approved for overnight wear (being a Daily Disposable lens).
I have fallen asleep with lenses in, but fortunately, usually only for maybe 20-30 mins (power nap) and very very seldom have I forgotten to take lenses out overnight. That was in the good old days of the complicated cleaning regime Lurker 2010 has described.
There is quite obviously a huge difference in how people feel on waking after an unplanned sleep with lenses in. I never really had much ill effect, or at least any discomfort lasted only minutes, but others have described symptoms akin to the lenses sticking to their eyes, etc. So it just confirms the phrase that everybody's eyes are different and react in different ways.
I would agree that the generally low Dk values of most Daily Disposable lenses and also the longer term hydrogel lenses makes them totally unsuitable for extended wear. However, at least one US lens manufacturer claims on their website that some of their hydrogel lenses with low Dk are suitable for extended wear. My optician disagreed entirely of course. When I tried to query the company about this statement, they did not wish to discuss it with a mere lens wearer. The whole Patient Care leaflet that contained this information was rather 'generic' in it's nature and looked like no one with any knowledge had approved it for publication. Quite incredible!
knotlob