J Korean Ophthalmol Soc.  2016 Jun;57(6):951-956. 10.3341/jkos.2016.57.6.951.

The Surgical Outcome and Stereopsis between Pseudodivergence Excess Type and Convergence Insufficiency Type

• Kang SI
• Lee YC
• Lee SY

• KMID: 2290498
• DOI: http://doi.org/10.3341/jkos.2016.57.6.951

Abstract

PURPOSE
To compare the surgical outcomes and stereopsis between pseudodivergence excess type and convergence insufficiency type in intermittent exotropia.
METHODS
In a retrospective comparative analysis of 42 eyes, 18 eyes that were of the convergence insufficiency type (group 1) and 24 eyes that were or the pseudodivergence excess type (group 2) were analyzed. Recession-resection was performed in the same eye. Success was defined to be within ±8 PD after 12 months postoperatively; more than ±8 PD was defined as recurrence. Stereopsis was measured by the Titmus test.
RESULTS
After the patch test, the mean preoperative near angle in group 1 was 35.56 ± 6.62 PD and the far angle was 23.06 ± 6.22 PD. In group 2, the mean preoperative near angle was 26.92 ± 6.30 PD and the far angle was 28.29 ± 7.41 PD. The group 1 postoperative (12 months) mean near angle was 6.89 ± 8.46 PD and the far angle was 6.11 ± 7.90 PD. In group 2, the mean postoperative near angle was 1.75 ± 2.85 PD and the far angle was 3.42 ± 3.98 PD. The success rate of group 1 was 50% and the success rate of group 2 was 83.3%. The success rate of both group were statistically significant differences (p = 0.021). The postoperative (12 months) mean of near stereopsis for group 1 was 588 ± 1,124 seconds, and group 2 was 101.25 ± 102 seconds. There were no statistically differences in postoperative (12 months) stereopsis.
CONCLUSIONS
The success rate of the pseudodivergence excess type was significantly higher than in the convergence insufficiency type.

Keyword

Convergence insufficiency type; Intermittent exotropia; Pseudodivergence excess type; Stereopsis

MeSH Terms

Depth Perception*
Exotropia
Ocular Motility Disorders*
Patch Tests
Recurrence
Retrospective Studies

Reference

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