A scratch in the center of a cat's eye should not be worrisome If the eye does not cloud up or If it does not cause pain. If the cat squints, waters, or paws at his eye, light may be hurting him. Frequently the third eyelid comes out to protect the injured eye.
If the injury is extensive, the surface of the cornea immediately surrounding becomes swollen and gets a cloudy or hazy look.
The cause of a corneal abrasion often can be suspected from it's location. Those in the upper part of the cornea can be caused by misdirected eyelashes. Lower corneal abrasions suggest a foreign body imbedded in the cornea. Abrasions near the inner corner of the eye suggest a foreign body beneath the third eyelid.