Comparison of AC/A Ratio in True and Simulated Divergence Excess Exotropia

http://doi.org/10.36351/pjo.v37i2.1192

Abstract

Purpose:  To compare the accommodation convergence per accommodation ratio (AC/A) in true and simulated divergence excess exotropia.

Study Design:  Comparative cross sectional study.

Place and Duration of Study:  Department of ophthalmology, Punjab Rangers teaching hospital, Lahore, from July 2019 to December 2019.

Methods:  The study included 20 patients each of intermittent exotropia (XT) true and simulated divergence excess exotropia (XT).All the subjects underwent complete orthoptic assessmentthat included AC/A ratio calculation through heterophoria method after monocular occlusion.

Results:  The Results showed that patients with true divergence excess exotropia have a high AC/A ratio as compared to patients with simulated divergence excess exotropia who have a normal AC/A ratio. 57% patients showed true divergence excess exotropia with high AC/A ratio while 43% had divergence excess with normal AC/A ratio.

Conclusion:  The response of AC/A was found to be higher in patients with true divergence excess exotropia after monocular occlusion.

Key Words:  Intermittent exotropia, True simulated divergence excess exotropia, simulated divergence excess exotropia.