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A comparison of refractive errors measured with Canon RK-F1

Poster Details

First Author: M.Kola TURKEY

Co Author(s):    A. Turk   A. Kalkisim   S. Mollamehmetoglu   H. Erdol     

Abstract Details


To compare measurements obtained using three autorefractometers in adult individuals.


Karadeniz Technical University, Faculty of Medicine, Department of Ophthalmology, Trabzon, Turkey.


Two hundred eyes of 100 patients, 46 female, with no additional ocular pathology other than refractive error were included in the study. Refractive errors were measured using Canon RK-F1 (I), Nikon Speedy-K (II) and Topcon KR-8800 (III) autorefractometers consecutively. The spherical equivalent (SE) and mean keratometry (MK) values obtained using the three devices were then compared.


Mean age of the participants was 30.37±11.07 (18-70).Mean SE values obtained with each of the three devices were -0.61±0.98 (-3.38–2.38), -0.8±1 (-3.63–1.88) and -0.61±0.95 (-2.88–2.25) D , respectively (p<0.001 [for I vs II p<0.001, for I vs III p=0.712, for II vs III p<0.001]). Mean MK values obtained with the three devices were 43.33±1.28 (40.5–47.63), 42.63±1.25 (39.94–46.88) and 43.31±1.28 (40.75–47.88) D, respectively (p<0.001 [for I vs II p<0.001, for I vs III p=0.012, for II vs III p<0.001]). Both SE and MK values obtained with the three devices exhibited a high level of correlation (r>0.9, p<0.001 for all).


All three devices produced measurements with a high level of mutual correlation. However, in SE measurement only the Canon and Topcon autorefractometers produced mutually compatible results, while all three devices produced differing results for MK values.

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