Best corrected visual acuity versus overcorrected visual acuity by LASIK in correction of Exotrpia

The presence of myopia may be associated with a decreased demand for accommodation and hence lower convergence. This may predispose to an increased risk of developing exotropia.The study was conducted on myopic patients with extropia to compare the effect of myopic LASIK overcorrection versus myopic LASIK with optimum correction on the deviation degree of exotropia. this study was performed on 60 myopic patients with extropia. Patients were randomlly allocated in two equal groups ; group A operated by Lasik with optimum correction and group B operated by Lasik with overcorrection by -0.75. Patients were followed up one day, one week, one month and three months after surgery at each time for UCVA, manifest refraction, BSCVA, and degree of exophoria. There was a statistically significant decrease of the angle in patients underwent overcorrection (15.56±8.00) compared to patients underwent optimal correction (30.50±12.06) (P-value). This finding means that myopic refractive error overcorrection may help to improve control and alignment in intermittent exotropia. Myopic overcorrection in patients with intermittent exotropia was associated with significant improvement in the intermittent exotropia as compared with optimum correctio