Analysis of accuracy of hand-held auto photokeratometer in measuring corneal diopter

Objective To investigate the accuracy of hand-held auto photokeratometer in measuring corneal diopter and its clinical application.Methods The corneal diopter in 60 cases(118 eyes) were measured by hand-held auto photokeratometer (SW-100 Suoer,TianJin) and manual keratometer (OM-4 Topcon,Japan),the results were compared.Results There was no significant difference in the highest(k1) and smallest(k2) value of mean corneal diopter,mean corneal astigmatism obtained from two photokeratometer(P0.05),but there was significant difference in axes of astigmatism between two photokeratometer(P0.05).Conclusion The hand-held auto photokeratometer is similar to manual keratometer in clinical value,and can be used in measuring corneal diopter.