Elements of Surgery

by Robert Liston

troublesome, the operation may be suspended until it ceases. The ocular fascia[33] is next divided, when the muscle, now fairly exposed, is to be cut across with the scissors, one of the blades of which is passed behind it. The moment this is accomplished, the eye, from the force exerted upon it by the hook, springs towards the opposite side, and the muscle retracts within its sheath, especially if it has been thoroughly liberated from its connexions with the surrounding parts. To effect this, which I regard as of paramount importance, the scissors should be carried for some distance around the ball, nearly as far, indeed, as the margins of the adjacent straight muscles.

As soon as the affected muscle is divided, the eye usually at once resumes its natural position in the orbit, moving, if the other be sound, in perfect harmony with it. Occasionally, however, it retains some degree of its original obliquity; in which case it becomes necessary to reapply the instruments, to ascertain the cause of it. This will generally be found to depend upon an imperfect division of the muscle, or of the surrounding cellular tissue, by which the muscle is prevented from retracting sufficiently within its sheath. In some instances it remains without any assignable cause, but rarely beyond a few minutes, or, at farthest, a few hours.

The operation being over, the eye is bathed in cold water, to rid it of any blood that may remain in the wound, and the patient is confined in a dark apartment. Low diet should be enjoined for a few days, and, if inflammation arise, recourse must be had to antiphlogistic measures. In no case have I yet been obliged to abstract blood; a dose of aperient medicine being all that was required. Locally cold or tepid water may be used, as may be most agreeable to the patient’s feelings. When there is a good deal of pain in the eye, with more or less constitutional disturbance, such as slight shivering, headache, and nausea, warm drinks and an opiate will be required. The ecchymosis which attends this operation, and which is sometimes considerable, demands no particular treatment: no inconvenience arises from it, and it commonly disappears in a few weeks. I have never known suppuration or abscess to follow the division of the muscles of the eye; such an occurrence implies unusual violence, and cannot be too much condemned. The same remark is applicable to the wounding of the sclerotic coat, and the escape of the humours of the organ; an accident which has happened several times in the hands of ignorant bunglers.

A few hours after the operation is completed, the margins of the incision become coated with coagulating lymph, which is sometimes effused in such quantities as to give rise to considerable pain, and a sensation like that produced by the presence of a foreign body. The vessels in the parts around are somewhat enlarged, there is more or less lachrymation, and the lids feel stiff and uncomfortable. The sclerotic coat at the bottom of the wound remains visible for five or six days, when it becomes covered with granulations, which, uniting with those at the sides, gradually fill up the gap; the whole process, from the commencement to the completion of the cicatrization, occupying from three to four weeks.

Now and then the process of cicatrization is retarded by the development of fungous granulations. When this is found to be the case, they should be snipped off with the scissors; a procedure decidedly preferable to the application of the nitrate of silver, which is not only painful but rarely effective.

It has been recommended by some surgeons that, as soon as the soreness occasioned by the operation has subsided, the patient should begin to turn his eye in a direction opposite to that in which it was held by the contracted muscle, and that these efforts should be continued daily until it regains its natural position in the orbit. In my early cases, before I had devoted much attention to the subject, I adopted and acted upon this suggestion, but the result in every instance disappointed me. Nor do I now perceive any good reason for following it, since it does not seem to me to be founded upon correct principles. Where the eye still retains some degree of obliquity after the operation, it may be positively assumed that the section of the affected muscle, or of the fasciæ by which it is invested, has been imperfect; and when this is the case it would be in vain to expect Complete success. Again, the eye operated on may be entirely straight, and yet not move in concert with the other. This I have witnessed repeatedly, and hence my invariable rule is to divide at once the corresponding muscle of the opposite side, for the reason already mentioned—that the distortion generally involves both organs.

The operation for strabismus is liable to occasional failure, the principal causes of which may be thus enumerated:—1. Imperfect section of the affected muscle, or of the ocular and submuscular fasciæ. To this subject I have already several times alluded, and it is not necessary, therefore, to offer any further remarks concerning it in this place, than to say that the operator should never neglect to divide these structures most thoroughly. In bad cases the scissors must be carried up and down as far as the contiguous straight muscles, so as to denude completely the sclerotic coat for more than one-third of its circumference. The fasciæ must be effectually raked up, otherwise it will be impossible for the muscle to retract fully within its sheath. 2. Excision of a portion of the conjunctiva, eventuating in contraction of this membrane during the process of cicatrization, may be stated as another cause of failure. As there can be no necessity for such a procedure, since it does in no wise facilitate the operation, I need hardly say that it should be studiously avoided. 3. Strabismus is sometimes complicated with other diseases, such as convulsions, epilepsy, hydrocephalus, and analogous lesions. When this is the case, the operation cannot be performed with any prospect of success, and had better be declined altogether. The existence of amaurosis does not necessarily lead to failure; if cataract be present, it should be broken or depressed either at the time of the operation or before. 4. But the most powerful cause of all, in my opinion, and one which has not been sufficiently insisted upon by writers, is the coexistence of strabismus in both eyes, and the fact that our operative procedures are usually limited to one of these organs; a circumstance at variance alike with good practice and common sense. In several instances in which only partial success attended my efforts, the whole difficulty was fairly ascribable to this cause; and so thoroughly am I persuaded of its importance, that I have laid it down as a rule never to operate on one eye only when it is certain both are affected. The only exception to this is where the patient is very young, when the section of a single muscle will sometimes, though even then not always, be sufficient. 5. A fifth cause of failure is the readherence of the posterior extremity of the muscle to an unfavourable point of the sclerotica, by which it is again enabled to exert an undue influence over the movements of the eye. The manner of obviating this occurrence has been already indicated.

The effect upon vision is at first rather disagreeable, at least in some instances. It is only by degrees that the affected organ recovers its functions, and in many cases a considerable period must necessarily elapse before this is brought about. Occasionally, in fact, the retina, from long disease or other causes, is so effectually paralysed that the sight is never restored, and it is in instances of this description that a slight return of the distortion may be looked for, however well the operation may have been executed. Another effect sometimes witnessed is double vision. This is obviously dependent upon a want of agreement between the optic axes, and rarely lasts more than a few days, unless the obliquity has been only partially remedied.

The only other effect which it is necessary to notice here, as attendant upon this operation, is a peculiar prominence of the eye. This is generally well-marked, though not equally so in all cases, and imparts to the organ a full, bold expression; it is accompanied with a considerable separation of the lids, and is caused by the liberation of the organ from its confined situation.