I have monthly contact lenses and after changing them out for a new month's lenses, I sometimes foget to throw them out straight away. Then I come back like and hour later and find that they have changed from the soft, flexible lens into a kind of warped and hard plasticy thing.
I was just wondering, why they do this? Do they just dry out? But what makes them go so solid and more rigid? How do they stay flexible when on my eyeballs?
Thanks!
Read more: Why do soft contact lenses go hard when you leave them out for a long time?