I. Boichuk, DMedSc; Alui Tarak, doctor

Background. There are individual reports on the effect of some preoperative characteristics of visual functions (like convergence, angle of deviation, presence of fusion and type of binocular vision) on the success of exotropia surgery. To date, however, it has not been established what are the major diagnosis-related prognostic factors for the success of surgery for exotropia.
The purpose of this study was to identify the preoperative characteristics of visual functions which have an effect on the success of surgery for exotropia.

There were 59 exotropes (age range, 10 to 21 years) included in this study, 33 had basic constant exotropia (group 1) and 26, intermittent exotropia (group 2).

Patients with myopia were 57.6% (34), with hypermetropia - 43.4% (25). The inclusion criterion was the patient's presence of congenital strabismus with corrected visual acuity with low-grade amblyopia, astigmatism and anisometropy not exceeding 2.0 dptr, without limiting eye mobility.

Patients underwent an ophthalmological and ortoptic examination of the motor and sensory systems of the eye. Patients with surgery success (postoperative orthotropes) were compared to those who had a residual exotropia of more than 10 prism diopters (PD) postoperatively in terms of the preoperative accommodative convergence–accommodation (AC/A) ratio, near point of convergence (NPC), distance stereopsis and near stereoacuity threshold.
You can read the article in the volume 5 of the Journal of Ophthalmology 2023.