Ive been wearing contacts for 20 years now with no problems. A few months ago my left eye got very red, no itching or burning or any other symptoms. When I took the contact out it hurt like crazy!!!! I left it out for a couple of days until the redness went away and tried again....same thing. I threw those contacts out. Yesterday I put in a new pair and the same thing is happening again. What could be causing this???? Thank you :)