Korean J Ophthalmol.  2018 Apr;32(2):134-139. 10.3341/kjo.2016.0105.

Stereopsis before and after Inferior Oblique Weakening Surgery

• Seol BR
• Choung HK
• Kim SJ

• KMID: 2408953
• DOI: http://doi.org/10.3341/kjo.2016.0105

Abstract

PURPOSE
To analyze stereopsis change before and after inferior oblique weakening surgery.
METHODS
We retrospectively reviewed the medical records of 31 patients who had undergone inferior oblique weakening surgery. The factors analyzed included sex, age at surgery, preoperative and postoperative visual acuity (VA), time from first detection to surgery, degree of inferior oblique overaction (IOOA), primary/secondary IOOA, exotropia/hypertropia, bilaterality, and type of surgery.
RESULTS
Eighteen patients with a mean age 7.3 ± 3.1 years exhibited stereopsis of 60 arc seconds or better before surgery and 17 had stereopsis better than 60 arc seconds after surgery. Postoperatively, stereopsis improved in 13 patients and deteriorated in 9. Better preoperative VA and the absence of superior oblique underaction were associated with better preoperative stereopsis. Better preoperative VA, postoperative VA, and the presence of head tilt were associated with better postoperative stereopsis. Unilateral inferior oblique weakening surgery and accompanying hypertropia were associated with improved stereopsis, while the absence of hypertropia was associated with deteriorated stereopsis.
CONCLUSIONS
In this retrospective study, 58.1% of patients tended to have bifoveal fixation. When a vertical deviation is present in the primary position due to unilateral IOOA, IO weakening surgery can be expected to improve binocular function.

Keyword

Depth perception; Strabismus; Surgery

MeSH Terms

Depth Perception*
Head
Humans
Jupiter
Medical Records
Retrospective Studies
Strabismus
Telescopes
Visual Acuity

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