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2016 ; 16
(ä): 33
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Comparison of the Orbscan II topographer and the iTrace aberrometer for the
measurements of keratometry and corneal diameter in myopic patients
#MMPMID27029933
Chen Y
; Xia X
BMC Ophthalmol
2016[Mar]; 16
(ä): 33
PMID27029933
show ga
BACKGROUND: The purpose of this study was to compare corneal power and horizontal
corneal diameter (white-to-white [WTW] distance) readings obtained by the Orbscan
II topographer and the iTrace aberrometer. METHODS: Keratometry readings in the
flat (Kf) and steep (Ks) meridians and WTW distance were measured with the
Orbscan II and iTrace systems in 100 myopic patients. Statistical evaluation was
performed using the paired t test, Pearson correlation, and Bland-Altman analysis
for comparison of measurement techniques. RESULTS: The mean keratometry values
with the Orbscan II and iTrace were 43.16?±?1.44 and 42.64?±?1.43 diopter (D),
respectively (P?0.0001). The mean WTW distance measurements with the Orbscan II
and iTrace were 11.57?±?0.34 and 11.33?±?0.36 mm, respectively (P?0.0001). For
the measurement of corneal power, the 95 % limits of agreement (LoA) between the
Orbscan II and iTrace were?-?0.21 to 1.21 D for the flat meridian and?-?0.15 to
1.25 D for the steep meridian. For the measurement of WTW distance, the range of
the 95 % LoA between the two devices was 0.47 mm. CONCLUSIONS: For some clinical
applications, the keratometry and WTW distance measurements obtained by the
Orbscan II topographer and the iTrace aberrometer differed greatly and therefore
were not interchangeable. TRIAL REGISTRATION: Clinical trials number:
ChiCTR-OCS-14005077 (August 2nd, 2014).