Abstract
IntroductionThe aim of this study was to find cases in which the axial eye length could not be measured with partial coherence interferometry (PCI) technology and to assess if it could be measured using swept source optical coherence tomography (ss-OCT) technology.MethodsAll patients were measured at their pre-assessment visit 1 week prior to cataract surgery using conventional optical biometry (PCI technology, IOLMaster 500, Carl Zeiss Meditec AG, Jena, Germany). Patients in whom one or both eyes could not be measured using PCI technology were invited to participate in the study and to be measured with the ss-OCT (IOL Master 700, Carl Zeiss Meditec AG, Jena, Germany) device.ResultsAltogether, 1226 eyes of 613 patients were measured consecutively, and 78 eyes were not measured successfully with PCI technology. Among those with unsuccessfully measured eyes, 23 patients were willing to participate in the study, and two of those were also unsuccessfully measured with the ss-OCT device (8.7%, 2/23). However, 91.3% (21/23) of the eyes that were unsuccessfully scanned with PCI technology were measurable with the ss-OCT device. The estimated overall rate of unsuccessful scans with the ss-OCT device was 0.5% (6/1226) ( p_{{chi^{2} }} < 0.01).Conclusionss-OCT technology significantly improves the rate of attainable axial eye length measurements, especially in eyes with posterior subcapsular cataracts, but also in eyes with dense nuclear cataracts, except for white cataracts.
Highlights
The aim of this study was to find cases in which the axial eye length could not be measured with partial coherence interferometry (PCI) technology and to assess if it could be measured using swept source optical coherence tomography technology
The introduction of partial coherence interferometry (PCI) has significantly improved axial eye length measurements in comparison to ultrasound measurements [1, 2]. This is because the accuracy of PCI measurements is significantly higher than the accuracy of applanation ultrasound measurements, and because the results of PCI are less dependent on the examiner [3,4,5]
The introduction of a composite scan method has reduced this problem, 4.7% of eyes still cannot be measured with PCI technology [8]
Summary
The aim of this study was to find cases in which the axial eye length could not be measured with partial coherence interferometry (PCI) technology and to assess if it could be measured using swept source optical coherence tomography (ss-OCT) technology. Patients in whom one or both eyes could not be measured using PCI technology were invited to participate in the study and to be measured with the ss-OCT (IOL Master 700, Carl Zeiss Meditec AG, Jena, Germany) device. Results: Altogether, 1226 eyes of 613 patients were measured consecutively, and 78 eyes were not measured successfully with PCI technology Among those with unsuccessfully measured eyes, 23 patients were willing to participate in the study, and two of those were unsuccessfully measured with the ss-OCT device (8.7%, 2/23). The introduction of partial coherence interferometry (PCI) has significantly improved axial eye length measurements in comparison to ultrasound measurements [1, 2]. Among the significant differences between PCI and ss-OCT technology are the wavelength and the measurement setup employed in each
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