The harmonius symmetrical action of the oblique muscles in all cases of oblique astigmatism : read before the Nashville Academy of Medicine, January 15, 1891 / by G. C. Savage.

  • Savage, G. C. (Giles Christopher), 1854-1930.
Date:
[1891]
Catalogue details

Licence: Public Domain Mark

Credit: The harmonius symmetrical action of the oblique muscles in all cases of oblique astigmatism : read before the Nashville Academy of Medicine, January 15, 1891 / by G. C. Savage. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

    7/26 (page 7)
    astigmatism. I represent it as falling on meridian 170° of the retina. The horizontal image in the left eye and the oblique image in the right eye, do not fall on parts of the two retinae that harmonize. The direction of either image in relation to the other cannot be changed except by artificial means—a proper cylindrical lens. This being true, the pair of unaided astigmatic eyes represented by figure 2 must see the arrow, double as shown in figure 8, unless something is done by the eyes themselves for the purpose of harmonizing the images. What is done will be shown later. Figure 4 represents a pair of hypermetropic astigmatic eyes, the left one having its best meridian vertical, and the right one having its best meridian at 45°. In these eyes there is a left horizontal image (image and arrow in same plane) and a right