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Klin Monbl Augenheilkd. 2015 Oct;232(10):1174-7. doi: 10.1055/s-0041-104776. Epub 2015 Oct 29.

[Induced Incomitance of one Muscle Strabismus Surgery in Comparison to Unilateral Recess-Resect Procedures].

[Article in German]

Author information

1
Klinik für Augenheilkunde, Universitätsklinikum Freiburg.
2
Praxis für Augenheilkunde, Praxis Prof. Grüb und Kollegen, Breisach.

Abstract

BACKGROUND:

Surgical correction of intermediate squint angles may be performed on one muscle alone or as a combined unilateral recess-resect procedure. No larger case series has yet systematically measured the amount of induced incomitance that could potentially lead to visual disturbances.

METHODS:

31 patients with strabismus and binocular vision (phoria or intermittent strabismus) were operated on one extraocular eye muscle; 30 patients underwent a unilateral recess-resect procedure. Preoperatively and three months postoperatively, we measured the latent angle of squint on a tangent screen over the horizontal 60° in 10° increments and then calculated the amount of induced incomitance.

RESULTS:

After one muscle surgery, the induced incomitance was 1.7° over a 20° gaze range, 3.2° over a 40° gaze range and 3.8° over a 60° gaze range. For recess-resect procedures, the induced incomitance was 1.4°, 2.6° and 3.4°, respectively. A significant correlation between the surgical dose and the induced incomitance was only seen in one muscle surgery for the 40° and 60° gaze range, but not for the 20° gaze range. A subgroup analysis of patients with an identical surgical dose in one and two muscle procedures (6-8 mm) found greater induced incomitance in one muscle procedures, but only for the 40° and 60° gaze range (p = 0.02). Double vision in any gaze direction was reported by 16 % of patients after one muscle surgery and 10 % of patients after unilateral recess-resect surgery (p > 0.05).

CONCLUSION:

One muscle surgery is a viable option in small and intermediate angles of squint. The induced incomitance is rather small and does not lead to significant visual disturbances in the central gaze range.

PMID:
26512848
DOI:
10.1055/s-0041-104776
[Indexed for MEDLINE]

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