Atlas of the external diseases of the eye : including a brief treatise on the pathology and treatment / by O. Haab ; edited by G. E. de Schweinitz.

  • Haab, O. (Otto), 1850-1931.
Date:
1899
Catalogue details

Licence: Public Domain Mark

Credit: Atlas of the external diseases of the eye : including a brief treatise on the pathology and treatment / by O. Haab ; edited by G. E. de Schweinitz. Source: Wellcome Collection.

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

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    the cornea, its depressing action being most marked when the eye is directed inward. Hence, when the light is held low and toward the right, the vertical distance between the images is greater than it is when the eye is forced to turn outward and downward. When the eye is directed out- ward and downward, the superior oblique rotates the ver- tical meridian inward ; hence the image of the left eye exhibits a greater nasal inclination above and the vertical separation is at the same time diminished. The image of the left eye therefore always remains to the left of that of the right; in other words, there is homonymous diplopia, because the superior oblique is an abductor. In paralysis of the inferior oblique, which, when it nor- mally acts alone, rotates the cornea outward and upward and tilts the upper extremity of the vertical meridian toward the temporal side, the image of the affected eye is found to the outer side and above its fellow, with a tem- poral inclination in its upper extremity. Again, the ver- tical separation of the double images is greatest when the eye is turned inward, and their obliquity most pronounced when the eye is turned toward the temporal side. The double images are homonymous, and the diplopia must be sought in the upper portion of the field of fixation. In paralysis of the superior rectus, which normally rotates the cornea upward and inward and tilts the upper extremity of the vertical meridian toward the nose, the image of the affected eye is found above and some- what to the inner side of its fellow, with a slight nasal inclination above. In abduction the nasal inclination is diminished and the vertical separation of the images increased. In paralysis of the inferior rectus, which normally rotates the cornea downward and slightly inward and tilts the lower extremity of the vertical meridian toward the nose, the image of the affected eye. is found below and a little to the inner side of its fellow, with a slight nasal inclination in the lower extremity. The nasal inclination