Contact lenses are a kind of corneal contact lens, because there are more nerve endings on the cornea, wear contact lenses to the cornea, easy to be irritated. The first time you wear contact lenses will have some difficulty, daily before wearing them, pay attention to clean hands, pay attention to identify positive and negative, usually can practice techniques and other tips to help wear. 1, clean hands: before wearing contact lenses, clean your hands and keep them dry. If you use unclean hands to wear, not only can your eyes sting, tears and other uncomfortable symptoms, serious eye infection; 2, identify the positive and negative: put the glasses on the fingertips of the index finger to look carefully, usually the front of the glasses look like a small bowl, smooth around, slightly concave inward. The reverse side of the glasses looks like a small cup, with a cut around it and turned outward. Be sure to distinguish between the front and the back of the glasses, otherwise your eyes will feel a distinct sting or foreign body sensation; 3. Practice the technique: separate the upper and lower eyelids with one hand, and use the fingertips of your index finger with the other hand to place the contact lens on top. It is best to put 1-2 drops of artificial tears in the contact lens, because of the attraction between the liquid, the lens is easier to adsorb to the cornea; 4, help fit: after fitting the contact lens, the patient can close the eyes slightly to help the lens fit. If no abnormality is felt, it means that the contact lens has been worn; 5. Other tips: when operating, patients should move gently and avoid long nails to avoid damaging the cornea.