Depends.. Daily lenses are usually quite fragile, and easily tear. You can often wear them for a second day, but after that, they get rough, and uncomfortable. Plus, Day lenses cannot easily be cleaned, meaning they get dirty after removal.

The same applies for week-month lenses. They are more or less 'guaranteed' for the set period, but can usually be used some additional days.

Word of caution: The quality of the lenses WILL deteriorate over time, and we ARE talking about your eyes here. If you have sensitive eyes, don't wear them beyond their expiration day.

It's a bit like with milk. You can take the risk of using it after the expiration date, but don't be surprised if it turns sour!
Source(s):
My experience with day- and month lenses

Asker's Rating:

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