Concerning "monthly disposable" lenses:
The first question to ask yourself is if you wear your lenses every day. If not, you can prolong the number of weeks of usage you get out of one pair. Disposable contact lenses have different levels of resistance to deposit build up. The time elapsed before this happens is so short due to the design of the lense. You receive a higher comfort level from these lenses due to how thin they are, compared to lenses which are designed to last roughly 6 months to one year before you must switch to a new pair (these are much thicker). Everyone's eyes produce these deposits at different rates. As soon as your lenses begin to feel gritty or even noticeable while in your eyes, it's time to switch to a new pair! It may be only after 2 weeks or it may be after 4 to 5. These days, monthly disposable lenses start out at only $14.98 per box of 6 lenses. As for expiration dates, lenses are generally manufactured with an expiration date a few YEARS away from your purchase date. Always check the end of your boxes to be sure. One last note, if you ever notices a small tear in the edge of your lenses, discard immediately. Do not risk scratching your cornea over such a little amount of money!!! :)
[This message has been edited by Opti_Sno (edited 02-04-2003).]