Originally Posted by Knotlob

I asked my optician about that and probably also CooperVision for Biofinity and both replied that it is strictly one month, even if worn only a few days in the month. That doesn't make much sense to me and being an engineer I like to be told, 'why' and not 'just because that's the way it is or we said so'. Is it protein build up causing a reduction in oxygen permeability? That was what my optician suggested, but then that would surely suggest you could wear the lens for a longer time than a calendar month if only worn a few days/week. Also, if you used a very good cleaning regime, perhaps ultrasonic, the lenses would be very clean and the issue of protein build up becomes less important.

Having said that I have talked to other contact lens manufacturers and asking the same question, but not specifying a particular brand of lens. This time the representative said yes, you could wear the lens based on the number of times you wore the lens, within reason. i.e. you couldn't really expect to wear the lens for 30 months if you only wore it once/month.

knotlob