our aim is to investigate the astigmatic power, axis and refractive changes after strabismus surgery using power vector analysis according topography

we prospectively recruited 51 patients (93 eyes) referred for strabismus surgery. Epidemiologic data such as age, sex and clinical data like cycloplegic refraction, amount of deviation, and type of surgery & muscle surgery extracted from files. Topography, Spherical equivalent (SE), JO( vertical & horizontal astigmatism) and J45 (oblique astigmatism) using power vectors were calculated according the topography. Postoperatively all measurements repeated at 1, 3 and 6 months & compared with preoperative data.

51 patient were recruited into study.In all groups, JO showed significant changes at the 6 month after surgery (P=0.0001).J45 did not change significantly postoperatively in all groups (p>0.05). Postoperatively, average K reading increased significantly in all groups(p<0.05). There was significant difference in the magnitude of changes in SE one and three month following surgery (P=0.0001).There were no significant difference between sex groups in SE and JO changes (P>0.05)

strabismus surgery tends to induce a statistically significant change in with the rule astigmatism and myopic shift in SE .This astigmatism change seems to remain within the 6 months following surgery.