Stereoacuity testing in the monofixation syndrome.

A group of patients with the monofixation syndrome were assessed prospectively to compare performance on Titmus and Randot stereograms under monocular and binocular conditions. These patients achieved monofixation either as a result of surgery for infantile esotropia, or because of a partially accommodative esotropia or significant anisometropia. Their ability to detect elevation of the Titmus circles was not significantly better with two eyes as compared to that level achieved using only their monofixating eye. However, performance on the Titmus animals and on Randot circles or animals showed better discrimination. These data would suggest that the monocular clues available in determining elevation of the Titmus circles would invalidate establishing a diagnosis of monofixation.