Evaluation of Factors Influencing Stereoacuity in Exodeviation

ABSTRACT

The purpose of this study was to evaluate factors influencing stereoacuity in exodeviation. We examined the visual acuity, refractive error, angle of exodeviation, fusional status with the Worth-4-dot test, and stereoacuity with the Titmus test preoperatively in 139 exodeviated patients who had undergone operation from August 1994 to February 1997. We evaluated the association of stereoacuity to the following factors with chi-square test sex, age at surgery, visual acuity, type and degree of refractive error, associated hypertropia, angle of exodeviation, and fusional status.The stereoacuity was normal-under 100 second of arc, when age at surgery was under 8 years, when visual acuity was 0.6 or better, when abgle of exodeviation was under 40 prowm and when fusion was intact at near only or both(p<0.05). There was no statistical significance between sex, type or degree of refractive error, associated hypertropia, and stereoacuity.Of these, age at surgery and fusional status were found to be independent factors influencing stereoacuity with discriminant analysis test. In conclusion, in aspect of perserving normal stereoacuity, age atsurgery and fusional status are important factors in the surgical criteria of exotropia.