Frequency of convergence and accommodative disorders in a clinical population of Mashhad, Iran

Hoseini-Yazdi, Seyed Hosein, Yekta, AbbasAli, Nouri, Hosein, Heravian, Javad, Ostadimoghaddam, Hadi, & Khabazkhoob, Mehdi (2015) Frequency of convergence and accommodative disorders in a clinical population of Mashhad, Iran. Strabismus, 23(1), pp. 22-29.

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Abstract

Purpose

To investigate the frequency of convergence and accommodation anomalies in an optometric clinical setting in Mashhad, Iran, and to determine tests with highest accuracy in diagnosing these anomalies.

Methods

From 261 patients who came to the optometric clinics of Mashhad University of Medical Sciences during a month, 83 of them were included in the study based on the inclusion criteria. Near point of convergence (NPC), near and distance heterophoria, monocular and binocular accommodative facility (MAF and BAF, respectively), lag of accommodation, positive and negative fusional vergences (PFV and NFV, respectively), AC/A ratio, relative accommodation, and amplitude of accommodation (AA) were measured to diagnose the convergence and accommodation anomalies. The results were also compared between symptomatic and asymptomatic patients. The accuracy of these tests was explored using sensitivity (S), specificity (Sp), and positive and negative likelihood ratios (LR+, LR−).

Results

Mean age of the patients was 21.3 ± 3.5 years and 14.5% of them had specific binocular and accommodative symptoms. Convergence and accommodative anomalies were found in 19.3% of the patients; accommodative excess (4.8%) and convergence insufficiency (3.6%) were the most common accommodative and convergence disorders, respectively. Symptomatic patients showed lower values for BAF (p = .003), MAF (p = .001), as well as AA (p = .001) compared with asymptomatic patients. Moreover, BAF (S = 75%, Sp = 62%) and MAF (S = 62%, Sp = 89%) were the most accurate tests for detecting accommodative and convergence disorders in terms of both sensitivity and specificity.

Conclusions

Convergence and accommodative anomalies are the most common binocular disorders in optometric patients. Including tests of monocular and binocular accommodative facility in routine eye examinations as accurate tests to diagnose these anomalies requires further investigation.

Impact and interest:

2 citations in Scopus
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ID Code: 83090
Item Type: Journal Article
Refereed: Yes
Keywords: Accommodation, binocular vision, convergence, facility, symptoms
DOI: 10.3109/09273972.2014.1002622
ISSN: 1744-5132
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Deposited On: 06 Apr 2015 23:58
Last Modified: 22 Jun 2015 23:57

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