The anomalies of the ocular muscles / by George T. Stevens.

  • Stevens, George T. (George Thomas), 1832-1921.
Date:
[1889?]
Catalogue details

Licence: Public Domain Mark

Credit: The anomalies of the ocular muscles / by George T. Stevens. Source: Wellcome Collection.

    1/116
    THE ANOMALIES OF THE OCULAR MUSCLES. By Dr. GEORGE T. STEVENS, New York. FIRST PAPER. L AFFECTIONS of the ocular muscles may be divided into those which are physiological peculiarities and those which result from pathological conditions. It is pro- posed now to consider the first of these two groups. In the normal adjustments of the eyes in the act of vision, two distinct classes of muscles perform each its separate office. The muscle of accommodation situated within the eyeball acting as focal adjuster for each eye, while the long muscles within the orbit direct the eyeballs in such a way as to bring the visual axes of the two eyes to bear upon the point for which the focal adjustment is made. The two classes of muscles are in a sense independent of each other, yet in a very important sense in close and inter- dependent relation. In the discussion of the anomalies of the ocular muscles, then, the relation of these two classes is to be constantly regarded. The affections of the ciliary muscles, constituting the essential factor in the subject of the accommodation of the eye, become a subject of special study, and not to be considered in this connection further than in respect to the reciprocal influences of the two classes of muscles. Such special conditions of the muscles of accommodation as may be necessary to refer to in order to obtain a proper understanding of their relations with the class of muscles more directly under consideration will be introduced as occasion demands. Reprinted from the Archives of Ophthalmology, Vol. xvi., No. 2, 1887.