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Accommodation in intermittent exotropia

Horwood, A. (2018) Accommodation in intermittent exotropia. In: 39th Meeting of the European Strabismological Association, 13-15th September 2017, Porto, Portugal, pp. 41-45. (Transactions of the 39th Meeting of the European Strabismological Association, Porto, Portugal, 2017 pp 41-45)

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Abstract/Summary

Purpose Accommodative convergence is often reported to be associated with the control of intermittent exotropia. This paper summarises our published studies on accommodation and convergence responses in distance exotropia. Methods. 19 children with clinically diagnosed distance exotropia were tested in detail using a remote haploscopic photorefractor which measured objective, simultaneous and continuous accommodation and convergence to a range of targets moving in depth, which contained different combinations of the three main cues to near responses (binocular disparity, blur and proximity/looming). We were able to study these children while controlling, during, and after decompensation to exotropia. Results Clinical classifications were rarely borne out by objective findings. Accommodation frequently relaxed dramatically on decompensation. Many strands of evidence suggest that convergence is the main drive to control of the deviation in all cases. Conclusion Convergence is the primary mechanism for the control of all the intermittent exotropias we tested. This was sometimes associated with secondary additional accommodation. Many clinical findings, such as a “high AC/A ratio”, reported symptoms, and response to common therapies can be explained by better by understanding the convergence to accommodation (CA/C) linkages in these patients

Item Type:Conference or Workshop Item (Paper)
Refereed:No
Divisions:Faculty of Life Sciences > School of Psychology and Clinical Language Sciences > Development
Faculty of Life Sciences > School of Psychology and Clinical Language Sciences > Perception and Action
ID Code:80022
Additional Information:Not available online. Access to publication via author or European Strabismological Association

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