Contemplation of the surgical normogram of lateral rectus recession for exotropia associated with superior oblique palsy.
OBJECTIVE
To suggest a surgical normogram for lateral rectus recession in exotropia associated with unilateral or bilateral superior oblique muscle palsy (SOP).


METHODS
We retrospectively reviewed the charts of 71 patients with exotropia who were successfully corrected over one year. Each patient had undergone unilateral or bilateral rectus recession associated with uni- or bilateral inferior oblique (IO) 14 mm recession, using a modified surgical normogram for lateral rectus (LR) recession, which resulted in 1 to 2 mm of reduction of LR recession. We divided all patients into 2 groups, the 34 patients who had undergone LR recession with unilateral IO (UIO) recession group and the remaining 37 patients who had undergone LR recession with bilateral IO (BIO) recession group. Lateral incomitancy was defined when the exoangle was reduced by more than 20% compared to the primary gaze angle. The surgical effects (prism diopters [PD]/mm) of LR recession were compared between the two groups using the previous surgical normogram as a reference (Parks' normogram).


RESULTS
The mean preoperative exodeviation was 20.4 PD in the UIO group and 26.4 PD in the BIO group. The recession amount of the lateral rectus muscle ranged from 4 to 8.5 mm in the UIO group and 5 to 9 mm in the BIO group. Lateral incomitancy was noted as 36.4% and 70.3% in both groups, respectively (p = 0.02). The effect of LR recession was 3.23 ± 0.84 PD/mm in the UIO group and 2.98 ± 0.62 PD/mm in the BIO group and there was no statistically significant difference between two the groups (p = 0.15).


CONCLUSIONS
Reduction of the LR recession by about 1 to 2 mm was successful and safe to prevent overcorrection when using on IO weakening procedure, irrespective of the laterality of SOP.
Department of Ophthalmology, Hallym University College of Medicine, Chuncheon, Korea.
Joo-Yeon
JY
Lee
Seung-Hyun
SH
Kim
Sung-Tae
ST
Yi
Tae-Eun
TE
Lee
Yoonae A
YA
Cho
D002648:Child; D005099:Exotropia / Q000150:complications / Q000503:physiopathology / Q000601:surgery*; D005133:Eye Movements; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D049451:Nomograms; D009801:Oculomotor Muscles / Q000503:physiopathology / Q000601:surgery*; D013508:Ophthalmologic Surgical Procedures / Q000379:methods*; D012189:Retrospective Studies; D016896:Treatment Outcome; D020432:Trochlear Nerve Diseases / Q000150:complications* / Q000503:physiopathology / Q000601:surgery