Even though I heard all the old wives tales when I first got them. "You can only wear them 6 - 8 hours a day, otherwise they'll scratch your eyes and you'll go blind." I typically wear them 14 - 16 hours a day.
"You'll only be able to wear them 5 - 10 years, they'll damage your eyes and you'll go blind." I've been wearing them for 26 years.
So my contacts haven't caused any more loss of eyesight, than my masturbating. Apparently old wives aren't that smart.