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Authors
Jonathan M. Holmes, BM, BCh, David A. Leske, MS, Sarah R. Hatt, DBO, Michael C. Brodsky, MD, and Brian G. Mohney, MD

Stability of near stereoacuity in childhood intermittent exotropia

publication date
2012 Oct 1
Category
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Abstract/Introduction

Purpose

To investigate the course of near stereoacuity in a cohort of children with untreated intermittent exotropia.

 

Methods

A total of 95 children aged 2 to 16 years with untreated intermittent exotropia were identified who had measurements of near stereoacuity, using the Preschool Randot (PSR) test on at least two successive examinations, with no intervening treatment. Deterioration was defined as a drop of at least 3 octaves, based on test–retest data. Alternative secondary analyses were performed defining deterioration as a drop of at least 2 octaves or as a transition from normal to subnormal. The main outcome measure was the deterioration rate calculated at 1 and 2 years using a Kaplan-Meier survival analysis.


Conclusion/Results

Results

For near stereoacuity, the rate of decreasing 3 or more octaves was 2% (95% CI, 0%-6%) at 1 year and 7% (95% CI, 0%-16%) at 2 years. The alternative secondary analyses revealed similar low deterioration rates. In most cases of apparent deterioration, near stereoacuity returned to baseline levels without treatment.

 

Conclusions

For children with untreated intermittent exotropia, deterioration in near stereoacuity at 1 and 2 years is infrequent. Therefore, performing surgery for intermittent exotropia to proactively prevent deterioration of near stereoacuity cannot be justified. Retesting stereoacuity is critical to determine whether any measured decrease in stereoacuity is real.


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