Comparison of Refractive Changes Between Hang-Back and Conventional Muscle Recession in Patients with Horizontal Strabismus
Abstract
Objective: To compare refractive changes after horizontal strabismus surgery between conventional and hangback
techniques.
Methods: The patients with horizontal strabismus were divided into two groups: one group received the
conventional technique, and the other received the hang-back technique. Parameters affecting refractive changes were
measured. These measurements were taken three times after surgery, at 1 week, 1 month, and 3 months.
Results: A total of 32 eyes from 21 participants were examined, 16 eyes in each group: 11 participants using the
conventional technique and 10 participants using the hang-back technique. Two pediatric ophthalmologists performed
surgeries at Rajavithi Hospital using the same standard table of surgical dosage. Preoperatively, the mean spherical
equivalent (SE) in the conventional group was –1.69 ± 1.75 D, whereas the hang-back group had a mean SE of –1.218
± 1.44 D (P value = 0.162). The mean corneal astigmatism in the conventional group was –1.13 ± 0.69 D, compared
to –1.13 ± 0.63 D in the hang-back group (P value = 0.253). After 3 months of follow-up, the average SE in the
conventional group was –1.92+2.28 D. However, the hang-back group had –1.40 ± 1.67 D (P value = 0.463). The mean
corneal astigmatism in the conventional group was –1.33 ± 0.77 D, compared to –1.28 ± 0.78 D in the hang-back group
(P value = 0.856).
Conclusion: No statistically significant differences in the refractive error after horizontal strabismus surgery
were observed between the conventional and hang-back surgery groups after the 3-month follow-up.
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