Work

Evaluation of binocular summation ratio before and after vision training in patients with intermittent exotropia: A pilot prospective cohort study

Year: 2025

Type: article

Abstract: PURPOSE: To investigate the binocular summation ratio (BSR) in intermittent exotropia (IXT) before and after vision training under varying light conditions, and to evaluate its association with the control of deviation. METHODS: Twenty IXT patients were included in the study. Patients were divided into three groups based on their control of deviation: poor, fair, and good control. Contrast sensitivity was assessed using the CSV1000-HGT chart at four spatial frequencies, evaluated both monocularly and binocularly from a distance of 2.5 meters. This evaluation occurred under both photopic and mesopic lighting conditions, with and without glare. Additionally, the BSR for each patient was calculated before and after the vision training process. RESULTS: The mesopic BSR under glare-free conditions demonstrated a significant increase following vision training. In the presence of glare, the mesopic BSR significantly increased across all spatial frequencies: 3, 6, 12, and 18 cycles/degree. Additionally, after vision training, the photopic BSR in glare-free conditions also showed an increase at all frequencies. However, under glare conditions, the photopic BSR only increased at the frequencies of 3, 12, and 18 cycles/degree, but this increase was not statistically significant. A significant increase in the BSR was observed only at the frequency of 6 cycles/degree. Furthermore, following vision training, the degree of control over deviation improved significantly. CONCLUSION: The BSR and deviation control scores in patients diagnosed with IXT demonstrated significant improvement following vision training, underscoring the efficacy of this treatment method in the management of IXT.

Source: Journal of Optometry

DOI: 10.1016/j.optom.2025.100542

Authors: Masoud Rostami, Mohammad Yaser Kiarudi, Mehdi Sharifi, Samira Hassanzadeh, Kasra Jafari

Institutions: Mashhad University of Medical Sciences, Iran University of Medical Sciences, Tehran University of Medical Sciences

Language: English

Topic: Ophthalmology and Eye Disorders

Subfield: Pathology and Forensic Medicine

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $2,030