A lens will get lost behind my eye. A thin membrane covers your eye and connects to the inside of your eyelids, making this a physical impossibility. Contact lenses are uncomfortable. After a brief adaptation period, most people don't even notice they're wearing contacts. Contacts can get stuck to my eye.
Contacts are too much trouble to take care of.
Wearing contacts causes eye problems. In general, this is not true if you're a conscientious wearer. Although contact lens-related problems can occur, they are rare and most result from not properly wearing or caring for lenses as instructed by your doctor. I'll never be able to get them in my eyes. Sure you will.