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Article
June 1954

SOME ASPECTS OF TORSION

Author Affiliations

READING, PA.
From the Department of Ophthalmology, Reading Hospital.

AMA Arch Ophthalmol. 1954;51(6):783-788. doi:10.1001/archopht.1954.00920040793005
Abstract

TORSION has been described by Donders1 in 1847, by Listing2 in 1854 and by Duke-Elder3 and many others; yet the subject of torsion remains unclear.

Of the two types, false and real, false torsion has become a controversial subject. In its demonstration, the projection obliquely of after-images on a flat wall caused distortion, a phenomenon which was finally explained by Le Conte4 in 1881. Donders' and Listing's laws do not permit actual turning about the anteroposterior axis of the eye in moving from a primary position obliquely to a tertiary position, but Márques5 quotes Helmholtz as believing that such turning does occur. Davson6 feels the terms rolling, or real, torsion and false torsion can be used indifferently. Duke-Elder3 draws a clear distinction between them.

The present paper is an attempt to clarify the picture. It consists, first, of a description of false torsion,

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