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Repeatability of wavefront measurements in pseudophakic eyes; Reproduzierbarkeit von Wellenfrontmessungen bei pseudophaken Augen;
摘要： Higher- as well as lower-order aberrations influence uncorrected visual quality after successful cataract surgery. Different techniques are used for measuring ocular wavefront aberrations, such as Hartmann–Shack aberrometers, laser ray tracing aberrometers, and automatic retinoscopy. The aim of our study was to assess the repeatability of a Hartmann–Shack aberrometer measurement in a pseudophakic study population. Methods This prospective study included patients who underwent cataract surgery 1 month prior to recruitment. Three consecutive Hartmann–Shack measurements (WASCA, Carl Zeiss Meditec AG, Germany) were performed after pharmacological dilation of the pupil. Results In total, 156 eyes of 156 patients were included. Repeatability of measurements was good in pseudophakic eyes for all Zernike polynomials up to the fourth order. The median values of the SD of all three measurements ranged between 0.042 and 0.125 for the Tecnis intraocular lens (IOL) and 0.028 and 0.148 for the CT Asphina 409MP IOL. Intraclass correlation coefficients ranged between 0.793592 and 0.97955 for the Tecnis IOL and between 0.673894 and 0.989172 for the CT Asphina 409MP IOL. Conclusion Postoperative unsatisfactory image quality, sometimes reported by patients, despite good defocus and astigmatism values calls for examination of higher-order aberrations. Hartmann–Shack measurements with the WASCA offers good repeatability in pseudophakic patients and, therefore, fulfills this task.
关键词： Repeatability,Higher-order aberrations,Hartmann–Shack aberrometry
更新于2025-09-23 15:22:29
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Nick-named laser radars
摘要： In this article the laser-based technologies for remote sensing that use laser radar principles, but still known under other names like photonics radar, optical coherence tomography, aberrometry, etc., are reviewed A look into some examples of a variety of such nick-named instruments and technologies is proposed assessing the arguments of them, being the members of the laser radar family.
关键词： optical coherence tomography,photonics radar,microradar,aberrometry,laser radar
更新于2025-09-23 15:19:57
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Clinical evaluation of the repeatability of ocular aberrometry obtained with a new pyramid wavefront sensor
摘要： Purpose: To evaluate the intrasubject repeatability of the ocular aberrometry obtained with a new ocular pyramidal aberrometer technology in a sample of normal eyes. Methods: A total of 53 healthy eyes of 53 subjects with ages ranging from 18 to 45 years were included in this study. In all cases, three consecutive acquisitions were obtained. Intrasubject repeatability of the measurements with a pyramidal aberrometer was calculated. Intrasubject repeatability for 4.0- and 6.0-mm pupils was evaluated within the subject standard deviation (Sw) and intraclass correlation coefficient. Results: Low values of the Sw and intraclass correlation coefficient outcomes close to 1 were observed for the sphere and cylinder at 3.0-mm pupil size. Most low Sw and intraclass correlation coefficient values close to 1 were observed for total, low-order aberrations and higher-order aberrations root mean square and for each Zernike coefficient analysis (intraclass correlation coefficient ?0.798) at 4.0-mm pupil size, with more limited outcomes for the aberrometric coefficient of Z(4, 4) with an intraclass correlation coefficient of 0.683. For a 6.0 mm pupil diameter, low Sw and intraclass correlation coefficient values close to 1 were observed for all aberrometric parameters or Zernike coefficients analyzed (intraclass correlation coefficient ?0.850). Conclusion: The new pyramidal aberrometer Osiris provides repeatable and consistent measurements of ocular aberrometry measurements in normal eyes.
关键词： pyramidal aberrometer,intrasubject repeatability,Ocular aberrometry
更新于2025-09-04 15:30:14