بررسي ميزان دقت اتورفركتومتر در تعيين عيوب انكساري چشم

EVALUATION OF AUTOREFRACTOMETRY ACCURACY IN REFRACTIVE ERRORS

Background and Objectives: Autorefractometer is usually used in every eye clinic. Clinical retinoscopy and Jackson cross cylinder refinement are very accurate methods for measurement of refractive errors. The aim of this study was to evaluate accuracy of autorefractor Topcon RM-A2000 for measurement of refractive errors. Materials and Methods: In a prospective study of refractive errors, a total of 300 patients, between 5-75 years old, underwent clinical retinoscopy, Jackson cross cylinder refinement and refractive error measurement with Topcon RM-A2000 autorefractometer for both the eyes. Sphere, cylinderical power and cylindrical axis examined by of autorefractometry were compared with the findings observed with clinical retinoscopy and Jackson cross cylinder refinement. Results: In our study, myopic shift was observed in eyes of all patients on autorefractometry due to instrument myopia. Conclusion: It is concluded that autorefractometry is an instrument for refractive error estimation and the results should be refined before spectacle prescription.