Improvement in distance stereoacuity following surgery for intermittent exotropia.
OBJECTIVE
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.
Adams
Wendy E
WE
Department of Ophthalmology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA.
Leske
David A
DA
Hatt
Sarah R
SR
Mohney
Brian G
BG
Birch
Eileen E
EE
Weakley
David R
DR
Holmes
Jonathan M
JM
D003867:Depth Perception; D004215:Distance Perception / Q000502:physiology; D005099:Exotropia / Q000601:surgery*; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007429:Intraocular Pressure; D009801:Oculomotor Muscles; D013508:Ophthalmologic Surgical Procedures; D013781:Texas; D015357:Vision Disparity; D014787:Vision Tests; D015348:Vision, Binocular; D014792:Visual Acuity