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Disparity-driven vs blur-driven models of accommodation and convergence in binocular vision and intermittent strabismus. | LitMetric

Disparity-driven vs blur-driven models of accommodation and convergence in binocular vision and intermittent strabismus.

J AAPOS

Infant Vision Laboratory, School of Psychology & Clinical Language Sciences, University of Reading, United Kingdom.

Published: December 2014

AI Article Synopsis

Article Abstract

Purpose: To propose an alternative and practical model to conceptualize clinical patterns of concomitant intermittent strabismus, heterophoria, and convergence and accommodation anomalies.

Methods: Despite identical ratios, there can be a disparity- or blur-biased "style" in three hypothetical scenarios: normal; high ratio of accommodative convergence to accommodation (AC/A) and low ratio of convergence accommodation to convergence (CA/C); low AC/A and high CA/C. We calculated disparity bias indices (DBI) to reflect these biases and provide early objective data from small illustrative clinical groups that fit these styles.

Results: Normal adults (n = 56) and children (n = 24) showed disparity bias (adult DBI 0.43 [95% CI, 0.50-0.36], child DBI 0.20 [95% CI, 0.31-0.07]; P = 0.001). Accommodative esotropia (n = 3) showed less disparity-bias (DBI 0.03). In the high AC/A-low CA/C scenario, early presbyopia (n = 22) showed mean DBI of 0.17 (95% CI, 0.28-0.06), compared to DBI of -0.31 in convergence excess esotropia (n=8). In the low AC/A-high CA/C scenario near exotropia (n = 17) showed mean DBI of 0.27. DBI ranged between 1.25 and -1.67.

Conclusions: Establishing disparity or blur bias adds to AC/A and CA/C ratios to explain clinical patterns. Excessive bias or inflexibility in near-cue use increases risk of clinical problems.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4270963PMC
http://dx.doi.org/10.1016/j.jaapos.2014.08.009DOI Listing

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