![]() "In analyses of reproducibility of sphere, cylinder, and axis, and of standard deviation, the system compared well with the commercially available systems," she concluded. Results for sphere, cylinder, and SE also were similar across all devices. Only eyes with up to 5 D of cylinder were included.Īmong all the systems, a strong correlation existed between the aberrometry-measured sphere and cycloplegic sphere as well as with SE measurements. The validation study enrolled 50 eyes of 25 patients that all were assessed using the new wavefront system and four other systems available at the practice site: a wavefront aberrometer (LadarWave, Alcon Laboratories), ray-tracing aberrometer (iTrace, Tracey Technologies), high-definition precision aberrometer (COAS-HD, Advanced Medical Optics), and wavefront-guided system (Allegro Analyzer, Alcon Laboratories). "We needed to assess its measurements based on comparable data, but there are no currently available methods for comparing wavefront data." "We faced a challenge in deciding how to evaluate this new system," Dr. Durrie, MD, who is in private practice at Durrie Vision Center, Overland Park, KS, compared its refractive output with that provided by commercially available wavefront aberrometers. With an interest in validating the performance of the new wavefront device, Dr. ![]() The investigational aberrometer has an inherent dynamic range of –15 to +25 D, which is larger than that of existing office aberrometry units and allows evaluation of a wide range of eyes, from those with high myopia to aphakia. That grating pair creates a fringe pattern that goes through a focusing lens, lands on a charge-coupled device camera, and is translated into the refractive state of the eye. Instead of continuing on through a lenslet array, however, the light is transmitted through a pair of Ronchi gratings that are separated by one Talbot plane. Similar to other aberrometers, laser light is projected into the eye and the aberrated wavefront that emerges passes first through relay lenses. The system uses Talbot-Moiré interferometry, which involves a different principle than the technology found on other commercially available wavefront aberrometers. Intraoperative measurement of sphere, cylinder, and axis adds less than 30 seconds to the procedure, and the device also analyzes higher-order aberrations. Von Sonnleithner C, Bergholz R, Gonnermann J, et al.The new wavefront aberrometer has a compact configuration that allows it to fit directly under the surgical microscope. Clinical results and higher-order aberrations after 1.4-mm biaxial cataract surgery and implantation of a new aspheric intraocular lens. The aspheric micro incision IOL was safely implanted through a 1.4mm incision and showed similarly good postoperative outcome in comparison to 1.8 and 2.2mm coaxial phacoemulsification. The best-corrected visual acuity (p=0.097), total ocular HOA (p=0.630) and coma (p=0.193) showed no statistically significant difference between the four groups. ![]() The root mean square of total ocular HOAs was measured at 0.419☐.191µm, spherical aberration was measured at 0.168☐.072µm and coma was measured at 0.213☐.200µm. In the Incise group, the mean best-corrected visual acuity improved significantly from 0.4☐.27 logMAR preoperatively to 0.05☐.07 postoperatively. Intraoperative and postoperative complications, best-corrected visual acuity, HOAs for a 5.0mm pupil using the iTrace aberrometer and endothelial cell loss were evaluated. The control groups consisted of patients operated with 1.8mm (coaxial MICS, Akreos MI60, 41 eyes), 2.2mm (small incision cataract surgery, Tecnis ZCB00, 44 eyes) and 2.2mm (small incision cataract surgery, CT Asphina, 46 eyes) coaxial phacoemulsification with implantation of an aspheric IOL. The B-MICS (1.4mm, 26 eyes) was followed by an implantation of a micro incision aspheric Incise ® IOL MJ14T (Bausch & Lomb, Rochester, NY, USA). recently compared six and three aberrometers, respectively, and described globally similar results among the compared devices. A total of 157 eyes of 106 patients were enrolled in this study. In addition, the iTrace aberrometer requires an experienced examiner for data acquisition since total aberration and corneal aberration cannot be obtained with a single scan. The aim of this study was to analyse the clinical outcome and higher-order aberrations (HOAs) after 1.4mm biaxial micro incision cataract surgery (B-MICS) and implantation of a new aspheric intraocular lens (IOL).
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