Do Contacts Expire If Not Opened? The Truth About Contact Shelf Life
The question of whether contacts expire if not opened is a common one, and the answer isn't a simple yes or no. It depends on several factors, primarily the type of contact lenses and how they're stored. Let's break it down:
Understanding Contact Lens Expiration Dates
Contact lenses, whether daily disposables, weekly disposables, monthly disposables, or extended-wear lenses, have expiration dates printed on the packaging. This date indicates the manufacturer's recommended replacement schedule, even if the lenses remain unopened. After this date, the lens's integrity is no longer guaranteed. This doesn't mean they'll suddenly become dangerous overnight, but the risk of damage, contamination, and eye irritation increases significantly. The material can degrade over time, leading to decreased comfort and a higher risk of infection.
Why Do Unopened Contacts Expire?
Even unopened contact lenses are subject to degradation. The materials used in contact lens manufacturing are susceptible to changes over time, particularly with exposure to environmental factors like temperature and humidity, even within sealed packaging. These changes can affect the lens's:
- Shape and flexibility: The lens might become less pliable or change shape slightly, affecting comfort and proper fit.
- Surface properties: The lens surface could become less smooth, potentially irritating your eyes or making it harder for tears to lubricate the lens effectively.
- Sterility: While manufacturers take great care to maintain sterility, the risk of microbial contamination, however small, increases over time, even within the packaging.
What Happens If You Use Expired Contacts?
Using expired contact lenses, even unopened ones, significantly increases your risk of several eye problems:
- Eye infections: Bacteria, fungi, and other microorganisms can accumulate on the lenses, leading to potentially serious eye infections like keratitis (inflammation of the cornea) or conjunctivitis (pinkeye).
- Discomfort and irritation: Changes in the lens material can lead to dryness, burning, itching, or blurred vision.
- Corneal damage: The accumulation of microorganisms and the deterioration of the lens material can damage the cornea, potentially leading to scarring or vision loss.
How Long Can You Keep Unopened Contact Lenses?
While the expiration date is the crucial marker, it's generally not advisable to keep unopened contact lenses beyond the manufacturer's recommended date, no matter how well you store them.
Proper Storage of Contact Lenses
Regardless of whether or not you've opened them, proper storage is essential to maintain the integrity of your contact lenses. Always follow the manufacturer's instructions for storage and handling. This typically involves keeping the lenses in their original packaging in a cool, dry place, away from direct sunlight or extreme temperatures.
What if I Accidentally Use Expired Contacts?
If you accidentally use expired contacts, monitor your eyes closely for any signs of irritation, redness, pain, or vision changes. If you experience any of these symptoms, immediately remove your contacts, and contact your eye doctor or ophthalmologist. They can assess the situation and provide appropriate treatment.
In Conclusion: While unopened contacts might seem safe to use past their expiration date, it’s strongly recommended against it. The risks associated with using expired lenses, even those that remain unopened, outweigh any potential benefits. Prioritizing eye health and following the manufacturer's recommendations ensures a comfortable and safe contact lens experience.
