DIVERGENCE INSUFFICIENCY AS A PRACTICAL PROBLEM

Abstract

DIVERGENCE insufficiency is a definite clinical entity. It exists as a practical problem, irrespective of whether pros or cons dominate the perpetual argument over existence of a divergence center in the brain. The variety of definitions in the literature suggests some confusion as to the characteristics and nature of the condition. Generally, it is the impression that differences of expression arise largely from a paucity of case studies carried out to reasonable completion. Thus, one writer draws conclusions from use of the Maddox rod and taking of ductions with Risley prisms. Another uses only the findings of prism-screen tests. Another allots more importance to lateral vergences at near points and tries to delegate to them arbitrary "normal" values, by which to be guided. It seems to matter little whether one considers divergence as an active process presided over by a brain center, located near the nuclei of origin of the