The cornea (clear part of the eye
where the contact lens
sticks to) is very pain-sensitive.
If one has pain after putting in a contact lens, there may be a torn contact lens, some dirt or an eyelash under the contact lens, a scratch on the cornea, or an infection of the cornea. The contact lens should be taken out right away, and rinsed and examined. If the eye still hurts, a doctor can evaluate.