by Louise A. Sclafani, O.D., F.A.A.O.

Question
My ophthalmologist said I could wear my brand of disposable contacts for two weeks. What happens if I wear them longer? Also, why can you sleep in some disposables and not in others?

Answer
Putting a piece of plastic on your eyeballs requires a certain amount of tender loving care. But these days, not all contacts are made of the same kind of plastic. What they are made of determines the kind of care you have to give.

DETERMINING FACTORS
Why you can wear some longer than others
Two main factors that contribute to how long you can wear your lenses, both daily and over the long term, are how well they breathe and how much they like to collect stuff.

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Your eyes need oxygen to stay healthy. Contact lenses are made of different kinds of materials that allow differing amounts of oxygen to get through. This makes certain types of lenses acceptable for sleeping.

You may wonder why it matters how much oxygen your eyes get if they’re closed anyway. Actually, the outermost portion of the cornea (the clear dome covering the colored part and pupil) gets much of its oxygen in dissolved form from the tears! Contact lenses can block this process.

Some materials are also more prone to deposits, such as proteins and lipids, which are normal components of our tears. If they build up on the lens, they can cause problems, including infection. (Besides, nobody wants to look through a dirty window.)

Various products are available to clean and disinfect lenses; however, if you don’t use them properly, or if you wear the lenses longer than the prescribed amount of time, you put yourself at risk for complications such as corneal ulcers and inflammation.

HIDDEN CHANGES
Why to listen to the rules--even if you think you're OK
People who overwear their lenses are often not aware of changes that may be occurring on their eyes because you can’t see them without a microscope. They may only finally visit their eye-care professional after a problem has advanced to the point of causing severe pain or vision loss.

It’s important to have your lenses evaluated routinely to be sure the wearing schedule is working well for your eyes and that your corneas remain healthy. At these visits, your provider can also offer new materials or solutions as they’re developed.

LOUISE A. SCLAFANI, O.D., F.A.A.O., is an associate professor of ophthalmology at The University of Chicago, chair-elect of the American Optometric Association Contact Lens and Cornea Section and a team eye doctor for the Chicago Blackhawks hockey team.

Last updated and/or approved: May 2008.
Original article appeared in summer 2007 issue. (Bio current as of summer 2007.)

Comments (6)

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true story
written by kim , March 07, 2010

ive been wearing my contacts for aproximatly 2 months and theres times when i cant see like i used to before with my contacts , so it does affect somehow your eyes . but remember everyone is different.

Overwear
written by Miles PRESS , July 31, 2009

Wearing the contacts 4 days longer won't make a huge difference if you are experiencing no problems such as redness or mucus discharge or decrease in vision. It is important to have a back up pair of glasses anyway as well as Don't wait till the last minute to order your new contacts or get a contact lens exam

Checking into it
written by Leigh Ann , January 02, 2009

Hi, Leanne. Thanks for the great question. I'll see if I can get one of our experts to answer. Please check back next week.

Best,

Leigh Ann Hubbard
Managing Editor
James Hubbard's My Family Doctor

Overwear
written by Leanne , January 02, 2009

What if I'm waiting for my new set of contacts to come in and I wear my disposable contacts a few days (4 at the most) longer than prescribed?

...
written by James Hubbard, M.D., M.P.H. , December 08, 2008

See your health-care provider. It may be under the upper lid and difficult for you to remove. In general that sort of thing could scratch your cornea and cause discomfort. Also any foreign body, including part of a contact, could eventually cause infection.
thanks for the comment

my contact lens broke inside my eye
written by kelsey , December 07, 2008

what happenif you think that you have a piece of contact lens in your eye?