Since frame eyeglasses turn out to be inconvenient to me, I brought the contact lenses 2 months ago. It really brings me much convenience to me. Wearing it, I can play my favorite volleyball without concerning about whether my frame eyeglasses will fall to the ground or not. However, recently I found that my eyes feel quite uncomfortable while I am wearing it, and my eyes are red sometimes. So I’m thinking about whether I keep wearing it for too long time? Can anyone tell me how many hours can I wear my contact lenses a day?