In few organs of the human body does one find such complicated, highly differentiated structures, with such a wealth of minute detail, as in the eyeball. At the same time the topographic relations vary not only in different persons, as is evidenced by the difference between an eye of more elongated structure and an eye constructed on shorter lines, but even in one and the same eye on different occasions—for instance, according to the width of the pupil, the thickness of the iris, the size of the lens or the age of the person.
For the ophthalmic surgeon the topographic relations are of paramount importance. It has been my observation that in spite of the many excellent books on the normal and the pathologic anatomy of the eyeball errors are of frequent occurrence. It is eminently necessary that the surgeon who operates on the eye shall be above all