Improvement in stereopsis following surgical correction of intermittent exotropia

Dr.Nalinodbhavi Bolla; Dr. G. Suparna

Volume : VII, Issue : XII, December - 2018

Improvement in stereopsis following surgical correction of intermittent exotropia

Dr. Nalinodbhavi Bolla, Dr. G. Suparna

Abstract :

Background:Exodeviation or divergent squint occurs as a result of certain obstacles to development or maintainance of binocular vision.Intermittent exotropia is an exodeviation intermittently controlled by fusional mechanisms.unlike a pure phoria,intermittent exotropia spontaneously eak down into a manifest exotropia. The aim of the study is to evaluate stereopsis improvement in intermittent exotropia after surgical correction.

Methods: The prospective study was conducted in 30 IXT patients reporting to Paediatric Ophthalmology department. Preoperative angle of deviation was measured for all patients with intermittent exotropia.Binocular function was measured using worth four dot test for distance and near. stereopsis was measured using Randot Stereotest for distance, and Titmus fly test for near. They underwent unilateral recession/resection or bilateral recession and were followed up at first and sixth month postoperatively

Results: In present study distance stereopsis was present in 30% pre-operatively.At post-op 1 month distance stereopsis is present in 46.6% and at post-op 6 months it is present in 56.6% which shows improvement in distance stereopsis at 1 month and 6months post-operatively

Near stereopsis in 43.3% of patients demonstrated 60 arc sec or better of stereopsis at 1month and 63.3% at 6 months as compared to 23.3% preoperatively.

Conclusion: There is a significant improvement in both near and distant stereoacuity postoperatively in X (T); however, the achievement of normal level depends upon the preoperative sensory status of the patient.

The percentage of cases showing improvement in near Stereopsis was greater than the percentage of cases showing improvement in distance Stereopsis after surgical correction of intermittent exotropia.