METHODS:The study included 64 eyes of 41 patients. Patients were divided into three groups:groupⅠ(a rectus recession, 25 eyes), group Ⅱ(a rectus recession combined its antagonistic muscle shortening, 32 eyes), group Ⅲ(a rectus recession combined its antagonistic muscle shortening and oblique resection, 7 eyes). Observation on refractive indexes and vector analysis program of spherical equivalent, spherical diopter, cylinder diopter, axis of astigmatism, corneal curvature,dk value and was performed 1d prior to surgeries and 1 and 4 wk after surgeries.

RESULTS:No significant changes were noted at 1wk postoperative on spherical diopter, cylinder diopter, Kh, Kv, axis of astigmatism, corneal curvature in the centrel area in radius of 3mm, while spherical equivalent and dk value increased significantly(P=0.011; P=0.013). However, these changes were disappeared at 4wk postoperatively. Among the three groups, no significant changes were observed in group Ⅰ, while dk value were changed in group Ⅱ at 1wk postoperatively(P=0.035). Cylinder diopter, spherical equivalent, dk value of group Ⅲ significantly increased at 1wk postoperatively(P=0.022; P=0.048; P=0.014). At 4 wk postoperatively, these changes were disappeared.

CONCLUSION:Strabismus surgeries can make reversible changes to the ocular refractive status. With different strabismus surgeries, the changes on the ocular refractive status are different.