Factors influencing stereoacuity outcomes in adults with acquired strabismus.
OBJECTIVE
Functional improvements of binocular vision after strabismus surgery in adults are common but not well understood. In a prospective study, factors associated with stereoacuity outcome in patients with strabismus acquired following binocular vision maturation were investigated.


METHODS
Prospective data collection.


METHODS
Twenty-three patients aged 14 to 85 years with acquired strabismus were enrolled. Random dot stereoacuity was quantified using a battery of tests including the Randot Preschool Stereoacuity test, the Randot (version 2) shapes test, and the Randot Butterfly test.


RESULTS
Ninety-six percent of patients achieved measurable stereoacuity following successful eye realignment. Better median stereoacuity is achieved in patients with the following characteristics: < or =12 months of constant strabismus (60 vs 400 seconds of arc with >12 months' strabismus, P < .001); a presurgical capacity for fine to moderate stereopsis (60 vs 400 seconds of arc with coarse or no measurable stereopsis, P < .005); a presurgical capacity for macular fusion (60 vs 400 seconds of arc with no measurable macular fusion capacity, P < .001); and postsurgical orthotropia (100 seconds of arc) or intermittent orthotropia (100 seconds of arc vs 2000 seconds of arc with 5 to 8 prism diopters (PD) of postsurgical residual strabismus, P < .05).


CONCLUSIONS
Surgical correction of acquired strabismus is associated with recovery of stereopsis. Factors associated with stereoacuity outcomes include duration of strabismus and presurgical binocular vision capacity. A postsurgical correction of orthotropia or intermittent orthotropia supports better stereoacuity than a larger residual angle of strabismus subtending up to 8 PD of deviation.
Fawcett
Sherry L
SL
Retina Foundation of the Southwest, Dallas Texas 75231, USA. fawcett@retinafoundation.org
Stager
David R
DR
Felius
Joost
J
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003867:Depth Perception / Q000502:physiology*; D006801:Humans; D008875:Middle Aged; D009801:Oculomotor Muscles / Q000601:surgery; D013508:Ophthalmologic Surgical Procedures; D011446:Prospective Studies; D020127:Recovery of Function / Q000502:physiology; D013285:Strabismus / Q000503:physiopathology* / Q000601:surgery; D015348:Vision, Binocular / Q000502:physiology*; D014792:Visual Acuity / Q000502:physiology*