http://www.greatcontactlens.net/ciba-contact-lenses/
Are Ciba Night and Day contact lenses dangerous?
I just read that you can wear them for up to thirty days, not even removing them to sleep. I was told that it's very dangerous to sleep in contact lenses as they can stick to your eyeball and damage it or something like that. Would you trust these contact lenses?
The problem is that the corneas of the eye breathe through the skin. Contact lenses restrict the flow of oxygen. During the day this is no problem. Enough gas flows through the lens. But when you close your eyes then your eyelids further restrict the flow.
Your corneas must get air or die so if you don't get enough oxygen to the eyes then tiny blood vessels will grow to supply the cornea. This is not good because you really want your corneas to be as clear as possible.
Another problem is that when you sleep the tear ducts switch off. Normally tears are produced continuously - they make their way into the nose where they evaporate. These lenses are 80+% water. They rely on tears to keep them inflated. Overnight they will dry out a bit. However when you wake up you soon reconstitute them. This is a nuisance but not serious. You won't scratch your eyes but it can be uncomfortable for a couple of seconds. I can make my eyes water with an artificial yawn so when I sleep in my lenses or if the eyes feel tired, I simply squeeze out some tears.
With regard to Ciba Specials? Well Ciba are a reputable company and long term lenses have been around for over 30 years so they should know about and have fixed any problems. One thing is that because you aren't messing about with your eyes every day then you reduce the possibility of eye infection - always a hazard when you stick your fingers in your eyes.
I may ask about them myself next time I renew my lens setup. But if I do then I will make sure that I attend regular eye examinations. And I might take them out once a week just to be safe.
Oh yes. There is another problem. I did have long term lenses years ago and I used to take them out every Sunday evening. Monday morning I would wake up with gummy eyes. I needed to wash my face before I could even think about putting lenses in. It turned out that I was just a little bit allergic to my laundry powder. During the week the eyes were protected by the lenses but Sunday night they were exposed. If I didn't wear the lenses at all then after a day or so the eyes go used to it and the problem went away.
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Clear Care Cleaning & Disinfecting Solution (2 X 16fl Oz Packs) $23.20 Value Pack 2-16 fl oz. bottles and free lens case with neutralizing disc.... |
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Clear Care Contact Solution - 2 pack / 16 oz - Total 32 oz $29.99 Increase comfort Increased wearing time Less dryness Less irritation and redness... |
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Biotrue Multi-purpose Solution 20-Ounce $15.50 Enjoy Healthy Lens Wear If you wear lenses, you must try Biotrue Multi-Purpose Solution that's effective and easy to use. Use this solution to take care of your eyes in an easy manner. Maintaining eye health and keeping them comfortable is a challenging task and this solution makes it easy for you. Sterile isotonic solution For soft contact lenses and silicone hydrogel lenses pH balanced t... |
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Clinical Manual of Contact Lenses $50.49 Thoroughly revised and updated—and now in full color for the first time—this manual is a complete, current, and convenient "how-to" guide to fitting, evaluating, and troubleshooting contact lenses, particularly specialty contact lens designs. The book is the perfect quick reference to consult during a patient's examination and a user-friendly study guide for boards. Each chapter includes clini... |
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MALAYSIA: Construction start-up on planned $140,000,000 optic contact lens plant, CIBA VISION [USA] Order #: 066006.: An article from: WWP-Report on ... & Plant Operations in the Developing World $5.95 This digital document is an article from WWP-Report on Engineering Construct & Plant Operations in the Developing World, published by Thomson Gale on June 1, 2006. The length of the article is 664 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view... |
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MALAYSIA: Construction start-up on planned $140,000,000 optic contact lens plant, CIBA VISION [USA] Order #: 066006.: An article from: WWP-Business Opportunities in Asia & the Pacific $5.95 This digital document is an article from WWP-Business Opportunities in Asia & the Pacific, published by Thomson Gale on June 1, 2006. The length of the article is 664 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.Citat... |
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Unizyme Enzymatic Cleaner, Tablets 12 ea $10.57 INDICATIONS Ciba Vision Unizyme Enzymatic Cleaner enzymatic cleaner (tablet) formulated to remove protein deposits from soft (hydrophilic) contact lenses. Use as directed by your eye care professional. |