Improvement in distance stereoacuity following surgery for intermittent exotropia
Presented in part at the 33rd Annual Meeting of the American Association for Pediatric Ophthalmology and Strabismus, Seattle, Washington, April 11-15, 2007.
Received 20 June 2007; accepted 27 September 2007. published online 14 December 2007.
Purpose
To evaluate whether distance stereoacuity improves following surgery for intermittent exotropia using the Frisby Davis Distance (FD2) and Distance Randot stereotests.
Methods
Eighteen patients (median age, 24 years; range, 5 to 68 years) with intermittent exotropia were prospectively enrolled. Stereoacuity was measured pre- and 6 weeks postoperatively using the FD2 and Frisby near tests (real depth tests) and Preschool Randot and Distance Randot tests (polaroid vectographs).
Results
Distance stereoacuity measured with the FD2 improved from a median preoperative value of 80 to 40 arcsec postoperatively (p = 0.04) and stereoacuity measured with the Distance Randot improved from a median of nil to 200 arcsec (p = 0.06). In those that had subnormal stereoacuity preoperatively, there was even more marked improvement in distance stereoacuity (FD2 median nil vs 40 arcsec, p = 0.002; Distance Randot median nil vs 200 arcsec, p = 0.004). Near stereoacuity measured with Frisby and Preschool Randot remained unchanged pre- to postoperatively (median, 60 and 80 arcsec, respectively).
Conclusions
There was improvement in distance stereoacuity measured with both the FD2 and the Distance Randot stereotests in patients who underwent surgery for intermittent exotropia. The FD2 and Distance Randot may be useful outcome measures in future clinical trials of interventions for intermittent exotropia.
aDepartment of Ophthalmology, Mayo Clinic College of Medicine, Rochester, Minnesota
bRetina Foundation of the Southwest, Dallas, Texas
cDepartment of Ophthalmology, University of Texas Southwestern Medical Center; Dallas, Texas
Reprint requests: Jonathan M. Holmes, BM, BCh, Professor and Chair, Department of Ophthalmology, Mayo Clinic College of Medicine, Rochester, MN 55905.
This work was supported by National Institutes of Health Grants EY015799 and EY011751 (JMH), EY005236 (EEB); Research to Prevent Blindness, Inc., New York, New York (JMH as Olga Keith Weiss Scholar and an unrestricted grant to the Department of Ophthalmology, Mayo Clinic), and Mayo Foundation, Rochester, Minnesota.
This study was conducted in the Department of Ophthalmology, Mayo Clinic College of Medicine and the Department of Ophthalmology, University of Texas Southwestern Medical Center.
The authors have no conflicts of interest to disclose.
ABSTRACT
