Originally Posted by lurker2010

Lenses designed for frequent replacement (daily and 14 days) don't generally hold up when cleaned by rubbing. "No-rub" solutions do a poor job cleaning lenses.

For many people lenses cleaned by "no-rub" solutions are in pretty bad shape after 7 days. Some people wear daily lenses because they can't even get 7 days use out of 14 day lenses and the lenses aren't even in good shape after 2-3 days.

Even if the 1 day and 14 days are identical, (some mfg are identical/some aren't) some people wear daily lenses to avoid the issues of no-rub cleaning. No matter how well I rubbed and used enzymes I only got around 60 days out of 90 day lens and maybe 7 days out of a 14 day lens.

A 14 day lens doesn't self-destruct after it's been cleaned 13 times. Some people can wear it for more days and some people fewer days.

The daily lens is marketed to people who can't clean a modern lens, protein deposits, or to people who don't want the hassle of cleaning a lens.

In other words one reason for daily lenses is the fact that, at least for some people, a 14 day lens is no good. A person who was prescribed a daily lens, because cleaning doesn't work well, is making a mistake stretching a daily lens for a week or more.