2ODTÜ Fen-Edebiyat Fakültesi Matematik Bölümü, Ankara Purpose: To evaluate the corneal topographic changes following pars plana vitrectomy (PPV).
Materials and Methods: Computer assisted corneal topographic analysis were taken preoperatively and at postoperative 8th week to 16 eyes of 15 patients who were performed PPV with the diagnosis of intravitreal hemorrhages, macular hole and retinal detachment. Central corneal refraction and simulated keratometry values were calculated as diopters in all patients. Preoperative and postoperative astigmatic differences were measured with these values. Surgically induced astigmatism was calculated with vector analysis method. Surgically induced astigmatism between 45-135 degrees was accepted as with the rule, astigmatism between 0-45 and 135-180 degrees was accepted as against the rule astigmatism.
Results: Pars plana vitrectomy induced against the rule astigmatism in all patients with a mean value of 0.41 diopter at postoperative 8th week.
Conclusion: Pars plana vitrectomy induces minimal corneal topographic changes because of the suturation of the sclerostomies. This particular point must be considered in the follow up period of the patients.
Keywords : Vitrectomy, corneal topography, vector analysis