A Model for Predicting the Results of Orthoptics in Patients with Equal Exodeviations

Abstract

ABSTRACT  Stepwise discriminant and discriminant analysis of the data of a retrospective study of patients with equal (or basic) exodeviation has been completed. Based upon this calibration data, these analyses have allowed the formulation of a classification criterion for the success of orthoptic treatment. Included in the model were the following factors: the frequency of the deviation, the AC/A ratio, the angle of deviation at the nearpoint and the recovery value of the distance positive vergences. Patients with latent deviations, higher AC/A ratios, smaller near angles of deviation and smaller recovery values were more likely to be successful. The model in the form of a pair of linearised discriminant functions is presented. The possible relationship of the model to real‐world processes, utility and limits are briefly discussed.

Key words:

• binocular vision
• equal exodeviation orthoptics
• stepwise discriminant analysis