Authors: Çağatay Çağlar Sücattin İlker Kocamış Emre Demir Mustafa Durmuş
Publish Date: 2016/07/08
Volume: 37, Issue: 3, Pages: 491-498
Abstract
To investigate the accuracy of the measurements of Nidek ALScan by comparing with Sirius CSO Florence Italy a corneal tomography which also employs the Scheimpflug principle and a commonly used device ultrasound biometry UB Aviso A/B Quantel Medical MT USA Right eyes of 85 healthy volunteers 58 women 27 men with a mean age of 3924 ± 1437 years range 15–68 were enrolled into this comparative prospective study Average K 24 average K 33 CCT central corneal thickness WTW white to white distance ACD anterior chamber depth and AL axial length were obtained from the ALScan and compared with average SimK CCT WTW horizontal anterior chamber diameter and ACD obtained from Sirius and also compared with ACD and AL obtained from UB The statistically significant difference was found between all of the measurements p 0001 except the average keratometry values K24 K33 SimK p = 0083 There was a perfect correlation between keratometry CCT and AL measurements of the devices ICC = 0977 0954 0923 respectively and there was a strong correlation between the WTW measurements of ALScan and Sirius ICC = 0865 While ACD parameter of ALScan and UB showed a perfect correlation ICC = 0977 there was a moderate correlation between ALScan and Sirius and also between UB and Sirius ICC = 0608 and 0664 respectively There was a high correlation between the all measurements besides ACD of ALScan and Sirius and they can be used interchangeably for average keratometry and WTW confidently However ACD and CCT have a broader 95 LoA −0039 to 0744 and −24985 to 3691 respectively In addition ALScan and UB were in good agreement regarding ACD while differences in AL measurements of UB and ALScan were clinically important 95 LoA = −0091 to 0703 Furthermore UB and Sirius have a moderate agreement regarding ACD 95 LoA = −0047 to 0680
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