I really struggle with this. Her dad gave in and took her to a high st optician and she now wears daily disposable lenses. It is supposed to be limited to 10 hours a day 2 to 3 days a week (minus 5 prescription), but already it is creeping up, and is a source of daily argument. The optician response is to try and sell me even more expensive lenses that "let in more oxygen" but I think a better response is not to wear them so often. I have bought her some lovely "designer" glasses with thin lenses, but the contacts still keep winning the day. She has friends who won't leave the house in glasses, so I am competing with strong peer pressure. Leaving (astronomical) cost aside for a moment, I and several of my friends found that long term (ie 10 plus years) of wearing lenses left us unable to wear lenses at all, because of high levels of discomfort - (although lenses in my day were not disposable, and I kept the same pair at university for a horrifying 3 years.) But anyway, I feel this is fairly uncharted territory, as nobody alive has worn lenses for more than say 40 years... My latest tactic is to withdraw funding, but I would like an objective view of the long term risks, that I could present to her - not scaremongering.