Clinical feature analysis of 943 concomitant exotropia cases

Abstract

Objective To explore the distribution of concomitant exotropia, and the influence on the binocular visual function caused by distribution and age. Methods Statistical analysis was performed on 943 patients with concomitant exotrorpia about the disrribution, age and binocular visual function. Results① Of 943 patients with concomitant exotropia, 536 patients had intermitant exotropia 307 exotropia 47 exotropia and 53 secondary exotropia. ②The influence on fusion and stereopsis caused by intermitant exotropia was less than by constant exotropia and infantile exotropia, the difference was significant (P <0.05).③ The influence on near distance stereopsis caused by convergence insufficiency type was greater than basic type, yet the influence on long distance stereopsis was less than the basic type, the differerice was significant (P ＜0.05).④ In the group of age＞ 12 years,conservation rate of fusion and near distance stereopsis was lower than in other groups, the difference was significant (P ＜0.05). Conclusions Intermitant exotropia is the largest group in concomitant exotropia. The influence on binocular vision caused by intermitant exotropia is the minimum. Patients .younger than 12 years old with concomitant exotropia have better binocular vision. Key words: Concomitant exotropia; Type; Age; Binocular visual function