Contact Lenses
Replace contact lenses after 1 to 30 days depending on type. The replacement schedule counts from opening, regardless of how often you wear them.
Depending on lens type, 1 to 30 days
How long you may wear contact lenses depends on the lens type and is a real health matter. Daily lenses are worn for one day and then thrown away. Two-week lenses last 14 days, monthly lenses 30 days — counted from first opening, not from the number of days worn. If you wear a monthly lens only occasionally, you must still discard it after 30 days.
Besides the replacement schedule there is the daily wear time. Most soft lenses should not be worn longer than about eight to twelve hours at a stretch, because the cornea needs oxygen, which the lens partly blocks. Your eye doctor or optician sets the individually tolerable wear time. Only lenses expressly approved for it may be worn overnight.
Overwearing is the most common and most dangerous mistake. Wearing lenses too long risks dry, irritated and red eyes, blurred vision and, in the worst case, corneal infections that can permanently damage eyesight. Red eyes, burning or a foreign-body feeling are warning signs at which the lens should be removed at once.
Just as important as the lens itself is hygiene. Wash your hands thoroughly before inserting and removing, clean the lenses only with fresh solution and never let them contact tap water or saliva. The storage case is filled with fresh solution daily and completely replaced regularly, about every one to three months. These recommendations match the guidance of eye doctors.
How do I spot overworn lenses?
The body signals clearly:
Red or burning eyes are the most common sign of too long a wear time.
Dry eyes or the feeling of a foreign body point to lack of oxygen.
If the image turns cloudy or blurred, the lens should come out at once.
Replacement schedule at a glance
The lens type sets the wear time:
| Lens type | Replace |
|---|---|
| Daily lenses | 1 day, then out |
| Two-week lenses | 14 days |
| Monthly lenses | 30 days from opening |
| Red / irritated eyes | out at once |
Care for them right
This keeps the eyes healthy:
Keep the schedule — discard daily, two-week or monthly lenses on time.
Wash hands — clean thoroughly before every insertion and removal.
Fresh solution — new solution daily, never tap water.
Replace the case — swap the storage case every 1–3 months.
Common myths
A few myths surround contact lenses:
No — the 30 days run from opening, even with only occasional wear.
It is — only specially approved lenses are meant for sleeping, or infections threaten.
Never — tap water can carry germs that cause severe corneal infections.
With persistent redness, pain or worsening vision you should remove the lenses at once and see an eye doctor — such symptoms are never normal. If you work a lot at a screen, you blink less often; regular breaks and rewetting drops (recommended by your optician) additionally prevent dry eyes. Contact lenses are a medical device and should always be fitted by an eye doctor or optician — even colored costume lenses without prescription pose a real risk to the eyes with a poor fit and lacking hygiene. If you notice first signs of intolerance, keep glasses as a fallback and wear lenses again only after a professional check.