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Distance stereoacuity in intermittent exotropia

Lookup NU author(s): Dr Deborah Buck, Nicholas Strong, Michael Clarke

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Abstract

Background: Studies of distance stereoacuity in intermittent exotropia suggest that normal stereoacuity corresponds to good control of the deviation and that reduced or negative stereoacuity signifies poorer control. Aim : To evaluate distance stereoacuity in intermittent exotropia using the Frisby Davis Distance stereo test (FD2). Methods: Children with intermittent exotropia where the near angle was less than or equal to distance were eligible for recruitment. Standardised prospective data collection included FD2 distance stereoacuity. This was a longitudinal study in which outcomes are reported for baseline, last follow-up (≥6 months before any surgery) or preoperative and last postoperative visits for those undergoing surgery. Results: 110 children with intermittent exotropia had FD2 stereoacuity tested at baseline: 70 comprehended the test. Mean (standard deviation (SD)) age was 4.6 (1.7) years (range 2-10 years). 41/70 (59%) showed positive responses: mean (SD) stereoacuity 30 (12) s of arc. The mean follow-up period before any surgery was 13 months (range 6-27 months). At follow-up, mean (SD) stereoacuity was 24 (11) s of arc. Preoperative and postoperative stereoacuity were not significantly different from those not undergoing surgery. Conclusion: This study was the first to report distance stereoacuity in intermittent exotropia using the FD2 stereo test: patients with intermittent exotropia can achieve normal levels of distance stereoacuity, but a considerable proportion, despite comprehending, showed a negative response. This suggests that using the FD2, distance stereoacuity in intermittent exotropia is either absent or normal rather than reduced. Possible reasons for this and its implications are discussed.

Publication metadata

Author(s): Hatt SR, Haggerty H, Buck D, Adams W, Strong NP, Clarke MP

Publication type: Article

Publication status: Published

Journal: British Journal of Ophthalmology

Year: 2007

Volume: 91

Issue: 2

Pages: 219-221

ISSN (print): 0007-1161

ISSN (electronic): 1468-2079

Publisher: BMJ Group

URL: http://dx.doi.org/10.1136/bjo.2006.099465

DOI: 10.1136/bjo.2006.099465

PubMed id: 16885187

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