In attempting to study the possible relation between retinal detachments and traction stress of the optic nerve on the retina during ocular rotation, I have approached the problem from the standpoint of applied mechanics. When the eye is rotated to a considerable degree in any direction the optic nerve has a tendency to exert traction on the retina in the region of the disk. There is not enough slack in the orbital portion of the nerve to prevent this pull in the extreme horizontal positions. The traction is dependent on the anatomic position of the globe, the degree of rotation and the length of the nerve. Such traction can be made manifest entoptically. Von Helmholtz, Purkinje and Czermak have described a circular spot of "light" which is evoked in the region of the blindspot by the lateral movements of the eyes. This spot, in a modified form, may be observed
FRIEDMAN B. MECHANICS OF OPTIC NERVE TRACTION ON THE RETINA DURING OCULAR ROTATION: WITH SPECIAL REFERENCE TO RETINAL DETACHMENT. Arch Ophthalmol. 1941;25(4):564–575. doi:10.1001/archopht.1941.00870100042005
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