Comparison Of Astigmatic Refractive Error And Corneal Curvature Measures Using The Retinomax K-Plus 2 Autorefractor/Keratometer To The Grand Seiko Autorefractor/Keratometer, Manual Corneal Reflex Keratometer, And Subjective Refraction

Purpose: To compare the inter-instrument repeatability of refractive and corneal
curvature measures on a population of patients with mild to moderate magnitude of
astigmatism. Methods: Readings will be acquired on thirty people (60 eyes). Subjective refractive sphere power, cylinder power and axis will be compared to the automated instruments. Front surface corneal power and axis for each meridian will be compared between the automated instruments and the manual corneal reflex keratometer. Results: The difference in raw data for each method will be calculated for each
parameter of every eye. The difference for each parameter will be evaluated statistically
to assess repeatability. Conclusion: The data will be summarized and compared to the ANSI Z80.1 standard to demonstrate if each of the methods provides the practitioner with clinically equivalent values.