[Skip to Navigation]
February 1935


Author Affiliations

From the Department of Nervous and Mental Diseases and the Department of Ophthalmology, Northwestern University Medical School.

Arch Ophthalmol. 1935;13(2):254-262. doi:10.1001/archopht.1935.00840020114014

A new doctrine of physiologic investigation has appeared. It concerns more especially the activity of muscles and nerves in relation to electrical stimulation. The groundwork was brought forth by Lapicque1 in his experimentation with nerves and nerve-muscle preparations. Of more recent date has been its practical application in neurology. Now its premises are creeping into ophthalmology as they relate to the musculature of the face, the extra-ocular muscles, the instrinsic muscles of the eye and, finally, the retina and optic pathways.

The term ``chronaxia'' may be defined as the time during which a current of twice the threshold intensity (i. e. two times as strong as the constant current which causes a minimal stimulation) must flow to produce a minimal stimulation. In this brief outline I shall attempt to explain in simple language the doctrine of chronaxia as it concerns the eye. An introduction into this subject

Add or change institution