Scultet explains the descriptions given by Celsus and Paulus, but they are sufficiently plain of themselves. (Arsen. de Chirurg. tab. 32.)
It will be perceived that the ancients applied the name staphyloma to two distinct, or at least considerably different diseases, namely, to enlargement with protrusion of the cornea, and to prolapsus of the iris connected with ulceration of the cornea. Heister, Wenzel, and other continental writers, use it in the same sense as the ancients. Scarpa and our English oculists apply it only to protrusion of the cornea, without ulceration.
SECT. XX.—ON HYPOPYON OF THE EYE.
Regarding hypopyon of the eyes it will be sufficient to deliver Galen’s account, which is to this effect:—“A certain oculist of our time, named Justus, cured many cases of hypopyon by shaking the head. Placing them, therefore, erect upon a chair, and grasping their head on both sides obliquely, he shook them so that we could see clearly the pus descending downwards; and, owing to the weight of the substance, it remained below, although cataracts will not remain unless fixed carefully.” And again, he says below, “oftentimes we evacuate the pus freely by dividing the cornea a little above the place where all the coats of the eye unite. This place is called by some the iris, and by others the corona.” These are the words of Galen in his work, ‘On the Method of Cure.’ After the discharge of the pus, we clean the ulcer with injections of honied water, or of the juice of fenugreek with the addition of some honey, and then apply the other treatment conformably.
Commentary. Galen recommends three methods of treatment for the cure of hypopyon; namely, by discutients, shaking, and incision. (Meth. Méd. xiv.)
Aëtius, Albucasis, and Haly Abbas, like our author, are advocates for shaking and incision. Neither of these methods is now much in use, but both have had their advocates in modern times.
SECT. XXI.—ON CATARACTS.
The cataract is a collection of inert fluids upon the cornea at the pupil, obstructing vision, or preventing distinct vision. It arises most commonly from a congelation and weakness of the visual spirit, and on that account the disease rather attacks old persons, and those who are debilitated by protracted illness. It is occasioned also by violent vomiting, a blow, and many other causes. Those kinds of cataract which are but commencing, as not being proper objects of surgery, have been treated of in the [Third Book]. We shall now give the characters of those which are fairly formed and have acquired consistence. All those, therefore, who have cataract see the light more or less, and by this we distinguish cataract from amaurosis and glaucoma; for persons affected with these complaints do not perceive the light at all. Wherefore, again, Galen well instructs us as to the consistence and difference of cataracts and which kinds ought to be operated upon. Having shut the eye affected with the cataract, and with the large finger pressing the eyelid to the eye, and moving it with pressure to this side and that, then opening the eyelids and observing the cataract in the eye; if it has not yet acquired consistence, a certain flow takes place from the pressure of the finger, and at first it appears broader, but straightway resumes its former figure and magnitude. But in those which have acquired consistence no change takes place as to breadth or figure from the pressure. But since this appearance is common to those which are of moderate consistence, and those which are over-compacted, we distinguish these cases from one another by their colour. For those which are of an iron, cœrulean, or leaden colour, are of moderate consistence, and fit for couching; but those which resemble gypsum and hailstones are over-compacted. After ascertaining these circumstances, as directed by Galen, having placed the patient opposite the light, but not in the sun, we bind up carefully the sound eye, and having separated the lids of the other, at the distance from the part called the iris towards the small canthus, of about the size of the knob of the specillum, we then with the point of the perforator mark the place about to be perforated; and if it is the left eye we operate with the right hand, or if the right eye with the left; and turning round the point of the perforator, which is bent at its extremity, we push it strongly through the part which was marked out, until we come to an empty place. The depth of the perforation should be as great as the distance of the pupil from the iris. Wherefore, raising the perforator to the apex of the cataract, (for the copper of it is seen through the transparency of the cornea,) we push down the cataract to the parts below, and if it is immediately carried downwards, we rest for a little, but if it reascends we press it back again. After the depression of the cataract we turn round the perforator and extract it gently. After this, bathing with water and injecting into the eye a little Cappadocian salts, we apply externally some wool soaked in the white of an egg with rose-oil, and bind it up, and at the same time bind up the sound eye, that it may not move. Then lodging the patient in an apartment below ground, we order him to remain in a state of perfect rest, and upon a spare diet; and the bandages are to be kept on, if nothing prevent, until the seventh day, after which we loose them, and make trial of the sight by presenting him with some object: but this we disapprove of during the operation and immediately after it, lest by the intense exertion the cataract reascend. If the inflammation become urgent we loose the dressing before the seventh day, and must direct our attention to it.
Commentary. See Celsus (vii, 7); Galen (Ars Medica, 35; Isagoge); Aëtius (vii, 53); Albucasis (Chirurg. ii, 23), Canamusali (vi); Avenzoar (i, 8, 19); Mesue (de Ægr. Oculi; 15); Haly Abbas (Pract. ix, 28); Jesu Hali (Tract. de Oculis, 68); Avicenna (iii, 3, 4, 20); Rhases (ad Mansor. ix, 27, and Cont. ii); Vegetius (Mulom. ii, 17.)