Comparison of manual and automated methods to determine horizontal corneal diameter

Abstract

Automated measurement of the WTW distance provides more precise results than measurements using manual methods. The Zeiss IOLMaster had the highest reliability in measuring corneal diameter.

White-to-white corneal diameter differences in moderately and highly myopic eyes: Partial coherence interferometry versus scanning-slit topography

“…9 Different methods are used to measure the WTW distance. They include the Holladay-Godwin gauge, 10 manual calipers, 10,11 the Orbscan II device (Bausch & Lomb), 10,11 the IOLMaster device (Carl Zeiss Meditec AG), 10 the Galilei device (Ziemer Group), 11 optical coherence tomography, 12 ultrasound biomicroscopy (UBM), 3 and magnetic resonance imaging 13 ; the results can vary between devices. Automated measures provide more precise results than manual techniques.…”

“…Automated measures provide more precise results than manual techniques. 10 The purpose of this study was to evaluate the differences in automated WTW measurements between the Orbscan device and the IOLMaster device in eyes with moderate to high myopia.…”

Intraobserver and interobserver repeatability of ocular components measurement in cataract eyes using a new optical low coherence reflectometer

“…Third generation formulas for IOL calculation use WW as a parameter in determining the IOL power [12], while the selection of angle supported and posterior chamber phakic intraocular lenses (pIOL) is based on calculations using the WW [13]. Angle-supported pIOLs have been associated with complications which arise from poor pIOL sizing.…”

Changes in the crystalline lens resulting from insertion of a phakic IOL (ICL) into the porcine eye

“…Therefore, it is important to determine the size of the ICL. For the insertion, it is important also to preoperatively determine the white-to-white measurement from which the actual fixation position [16], sulcus to sulcus, can be predicted. However, there is not always a correspondence between white-to-white and sulcus-to-sulcus, and indeed, it differs greatly between individuals.…”