Journal of American Association for Pediatric Ophthalmology and Strabismus
Major ArticlesStereoacuity and foveal fusion in adults with long-standing surgical monovision*,**,*
Section snippets
Subjects
Subjects included 32 consecutive adults with monovision produced by LASIK or PRK surgery and 20 age-matched control subjects. Patients enrolled were those who chose to have LASIK or PRK surgery to produce distance vision in their dominant eye and near vision in their nondominant eye, eliminating the need for optical correction for both distance and near viewing. At the time of testing, all participants had monovision for at least 6 months duration (mean duration, 14.5 months; range of duration,
Results
Longstanding surgical monovision had a significant effect on random dot stereoacuity (Kruskal-Wallis one-way ANOVA by ranks: H = 16.062; P <.001). As shown in Figure 1, pairwise multiple comparisons indicated both groups of surgical monovision patients had significantly worse random dot stereoacuity compared with age-matched control subjects (Dunn's pairwise comparisons, P <.05).
Discussion
The disruption of binocularity by anisometropia that leads to amblyopia and a loss of binocularity in the young of the species, including cats,17, 18 primates,19 and humans,3, 5, 20 is a well-documented adverse outcome. Monovision is an anisometropia that is artificially created for the adult presbyope for the purpose of achieving 20/20 vision at near and at far viewing distances without bifocal correction. Several studies of binocular function in presbyopes with monovision corrections report
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Supported by Fight for Sight PD99007 and National Institutes of Health EY05236.
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This study was conducted at the private practices of Drs Alfieri and Castleberry.
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Reprint requests: Sherry Fawcett, PhD, Retina Foundation of the Southwest, 9900 N. Central Expressway, Suite 400, Dallas, TX 75231 (e-mail: [email protected]).