Aëtius gives a full account of the treatment of ectropion from Demosthenes and Antyllus. When the disease is occasioned by fungous flesh on the inner membrane of the eyelid, he recommends us to burn it down with escharotics, such as misy, chalcitis, &c. (See the Third Book.) He describes the surgical operation in the following terms:—when the fleshy excrescences are very large they are to be dissected out with a scalpel, and the part touched with burnt copper or the like. When the eversion is greater, he directs us to perform an operation upon the inner part of the eyelid, making two incisions, which unite below like the Greek letter Λ, and afterwards dissecting out this lambdoid or triangular piece, and along with it the flesh below, which, he remarks, is not cartilaginous like the upper eyelid, but taking care to preserve the skin untouched. The edges of the incisions are then to be united by one suture at the eyelids. When the ectropion is occasioned by an external cicatrix, we are to operate upon the inner surface of the eyelid in the manner just now described, only avoiding to make deep incisions, and uniting the edges of the incisions as before directed. Then stretching the cicatrix with a hook, and pushing a needle armed with a double thread, under the thickened flesh from the smaller canthus to the larger, we are to cut down upon the needle and divide the thickened flesh. A pledget of lint is then to be put into the external incision, and a compress, moistened with cold water, applied with a bandage. He directs us to avoid warm fomentations until the ligatures drop out. When ectropion arises from the excrescence called encanthis, he recommends us to dissect it out. When the disease is occasioned by paralysis, or arises from too large a portion of the eyelid having been cut out in the operation for entropion, he pronounces it to be incurable. It is also said to be incurable when occasioned by the sloughing of carbuncles. Celsus says that ectropion arises either from an operation for inversion improperly performed or from old age. In the former case he directs us to make an incision like that for lagophthalmos, only with this difference, that the horns of it are to be turned to the jaws (maxillas) and not to the eye. When it arises from old age he recommends us to burn the excrescence with a slender piece of iron, and then to anoint it with honey.