Since the iTrace is the only device that can accurately scan the complex architecture of a premium IOL, these post-surgical benefits are not exclusive to toric lenses. A surgeon can easily review the estimated benefits of rotating a toric lens with a patient after understanding how much cylinder is likely to change. The iTrace’s wavefront map displays both the axis of the cylinder internally and the corneal steep axis, which is confirmed by topography.īecause ray tracing is the only way to accurately measure through a toric lens, the iTrace is the only device that calculates the predicted post-surgical refraction and automatically suggests any rotation that will optimize the location of a toric lens. The iTrace calculates cross cylinder and verifies whether a toric IOL is off-axis or off-power.Īfter a toric implantation, the lens cylinder power should match the corneal steep axis. Determining the post-operative axis location does not need to be a time-consuming or uncomfortable process. 2002 43:2508–2512.A 30-second iTrace exam evaluates the post-operative alignment of a toric lens without dilating a patient. Pupil location under mesopic, photopic, and pharmacologically dilated conditions.
Evaluation of the Comparability and Repeatability of Four Wavefront Aberrometers. Visser N., Berendschot T.T.J.M., Verbakel F., Tan A.N., de Brabander J., Nuijts R.M.M.A. Repeatability of aberrometric measurements in normal and keratoconus eyes using a new Scheimpflug–Placido topographer. Pentacam® Corneal Tomography for Screening of Refractive Surgery Candidates: A Review of the Literature, Part I. In most of the conventional approaches for correcting eyesight, global parameters of eye. Motlagh M.N., Moshirfar M., Murri M.S., Skanchy D.F., Momeni-Moghaddam H., Ronquillo Y.C., Hoopes P.C. Tracey iTrace Combines, autorefraction, corneal topography, auto-keratometry, wavefront aberrometry and pupillometry in one system Millions of people around the world have eyesight problems that compel them to seek ophthalmic intervention, mostly using glasses or contact lenses for sight correction. Applications of corneal topography and tomography: A review. Scheimpflug aberrometry keratometry ray tracing tomography.įan R., Chan T.C., Prakash G., Jhanji V. Pentacam HR ® had a trend to record more negative J45 (myopic oblique astigmatism). iTrace ® operates with lower illumination, giving larger pupil size than Pentacam HR ®, which uses intense blue light during measurement. Corneal Z40 was significantly different with more negative Z40 with iTrace ® compared to Pentacam HR ®. In summary, these devices cannot be used interchangeably. Pupil size was smaller with Pentacam HR ® ( p < 0.01). J45 was negative with the Pentacam HR ® (more myopic oblique astigmatism) but significantly correlated between the devices. J0 was negative with both devices (against-the-rule astigmatism), but there was no correlation. There was no difference in K1, K2 and mean astigmatism. The devices were in complete agreement for Z3 - 1 ( p = 0.78) and Z3 + 1 ( p = 0.39), with significant correlation between the machines (r = -0.38, p < 0.01 and r = -0.6, p < 0.01). We found a significant difference in Z40 (Pentacam ®: +0.30 ± 0.11 µm and iTrace ®: -0.03 µm ± 0.05 µm p < 0.01) with no correlation between the devices (r = -0.12, p = 0.22). Anterior corneal aberrations (spherical aberration (Z40), vertical coma (Z3 - 1), horizontal coma (Z3 + 1)), keratometry in the flattest (K1) and steepest meridian (K2), mean astigmatism, astigmatic vectors (J0 and J45), and pupil size were measured. In this observational study, 100 eyes (50 healthy volunteers) were scanned in mesopic light condition with a Pentacam HR ® and iTrace ®. This study aimed to assess the anterior corneal wavefront aberrations, keratometry, astigmatism vectors and pupil size between Pentacam HR ® (Oculus Optikgeraete GmbH, Wetzlar, Germany) and iTrace ® (Tracey Technologies Corp., Houston, TX, USA).
0 kommentar(er)
