Diseases of the Eye And Ear a Manual for Students And Practitioners
Diseases of the Eye And Ear a Manual for Students And Practitioners
Arthur Nathaniel Alling
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Define astigmatism. State varieties and Describe presbyopia. CHAPTER XX. THE MUSCLES OF THE EYE. The physiologic action of the external muscles of the eye- ball is as follows : Internal rectus turns the eye inward (adduction). External rectus turns the eye outward (abduction). Superior rectus turn the eye upward and inward (ad- duction), and rotates the upper extremity of the vertical meridian inward (wheel rotation or torsion). 136 THE MUSCLES OF THE EYE, Inferior rectus turns the eye downward... and inward, and rotates the upper end of the vertical meridian outward. Superior oblique rotates the upper end of the vertical meridian inward, and turns the eye downward and outward. Inferior oblique rotates the upper end of the vertical meridian outward, and turns the eye upward and outward. The monocular ^e/(i of fixation is the area outlined by the limits of movement of each eye when the head is at rest. Errors of motility comprise : I. , Insufficiency ; II. , Stra- bismus; and III. , Paralysis.
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