RESEARCH ARTICLE


Acquired Vertical Accommodative Vergence



Ulrike Klein-Scharff , Guntram Kommerell, Wolf A Lagrèze*
Universitäts-Augenklinik, Freiburg, Germany


2008 Bentham Science Publishers Ltd

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.5/) which permits unrestrictive use, distribution, and reproduction in any medium, provided the original work is properly cited.

* Address correspondence to this author at the Universitäts-Augenklinik, Killianstr. 5, D-79106 Freiburg, Germany; E-mail: wolf.lagreze@uniklinik-freiburg.de


Abstract

Vertical accommodative vergence is an unusual synkinesis in which vertical vergence is modulated together with accommodation. It results from a supranuclear miswiring of the network normally conveying accommodative convergence. So far, it is unknown whether this condition is congenital or acquired. We identified an otherwise healthy girl who gradually developed vertical accommodative vergence between five to 13 years of age. Change of accommodation by 3 diopters induced a vertical vergence of 10 degrees. This observation proves that the miswiring responsible for vertical accommodative vergence must not necessarily be congenital, but can be acquired. The cause and the mechanism leading to vertical accommodative vergence are yet unknown.

Keywords: Strabismus, vergence, vertical, accommodation.