Title: Changes in Refractive Status after Strabismus Surgery- A Clinical Study
Authors: Dr Accamma Mamman, Dr Saji Nair A
DOI: https://dx.doi.org/10.18535/jmscr/v5i5.121
Abstract
Aim: To analyse the changes in the refractive status occurring in the eyes after strabismus surgery.
Materials and Methods: An analytical study was conducted in 90 patients who underwent strabismus surgery for concomitant horizontal strabismus. The patients were divided into two groups of 45 each. Group 1 comprises of patients with concomitant exotropia and Group 2 patients with concomitant esotropia. Pre operative cycloplegic refraction was done and post operative cycloplegic refraction was done at one week, four week, three month and six months post operatively. Pre and post operative refraction was compared in terms of spherical equivalent and cylindrical power.
Results: The spherical equivalent showed a change to myopic trend in both the groups which was maximum in the first post operative week. The changes were persisting at 12 weeks post operatively in both the groups, having stabilized by about four to six weeks. The difference from preoperative values were not statistically significant in both the groups. Astigmatism also showed a myopic trend post operatively. The mean change in the meridional equivalent at 180 degree was statistically significant in both the groups. The mean change in the meridional equivalent at 90 degree was not statistically significant in both the cases. The changes in the refractive status occurring when two muscles are encountered in the same eye showed more change in refractive status than when only one muscle was encountered and was also statistically analysed using paired t test and was found to be significant.
Conclusion: Strabismus surgery changes the refractive status post-operatively. Hence appropriate prescription of glasses is important following strabismus surgery especially in children to prevent amblyopia and to maintain stable fusion.
Key Words: Strabismus , Spherical equivalent, Astigmatism, Corneal topography, Refractive error
