Keratitis
inflammation of the cornea, with congestion of the conjunctiva and sclerotic coat of the eye, which may go on to infiltration by pus, and destruction of the sight by ulceration. Three forms are found-viz., syphilitic, strumous or scrofulous ophthalmia, and pustular corneitis. Keratitis, when associated with suppuration, as in smallpox, and other affections, is called onyx, from its resemblance to the lunula of the nail.