In addition to opacities, or spots produced by ulcers, the cornea sometimes becomes partially opaque in consequence of inflammation, or pannus. There are also various other forms of opacities.

The Treatment of Opacities of the Cornea

Very extensive opacities of the cornea sometimes wholly disappear in time without treatment; but in many cases, the most thorough treatment is ineffectual. In order to secure absorption, it is necessary to increase the activity of the circulation in the eye, which may be accomplished by means of astringent solutions-as a weak solution of alum, or tannin, one or two grains to the ounce of water, or still better, by means of hot fomentations or the hot spray to the eye. The spray should be used daily for fifteen or twenty minutes.

The spots cannot be removed by an operation, as many people suppose, as they are in the substance of the cornea itself, not "films over the eye," as they are sometimes called. Sometimes, however, when the opacity is immediately over the pupil, so that the sight is greatly interfered with, benefit may often be derived by an operation known as iridectomy, by which an artificial pupil is made at one side by cutting an opening through the iris. An ingenious London surgeon some years ago removed the opaque portion of the cornea in a case under his care, and substituted for it a portion of a healthy cornea from the eye of a rabbit. Attempts have been made to substitute a piece of glass for the opaque portion of cornea, but without success.