![]() Corneal tomography is also valuable in terms of the above, but in addition it provides more anterior chamber dimensions in terms of angle, depth, and volume. On the odd occasion, however-if the clinical picture warrants it-I add iTrace topography and aberrometry and Cassini corneal topography (i-Optics).Ĭorneal topography is essential to determine any irregular astigmatism and identify a large angle kappa, two clinical conditions that will prevent me from using multifocal IOLs. I do the following diagnostic tests routinely: corneal topography, corneal tomography, and optical coherence tomography (OCT) of the macula and optic nerve. CUMMINGS, MB ChB, FCS(SA), MMed(Ophth), FRCS(Edin) Chang is a member of the CRST Europe Global Advisory Board and states that he has no financial interest in any instrument or technique he describes. Chang, MD, is a Clinical Professor at the University of California, San Francisco, and in private practice in Los Altos, California. An entire bilateral exam takes only a few minutes, and the machine footprint is like that of any topographer.ĭavid F. The iTrace also automatically measures angle kappa and angle alpha and has a unique toric IOL planner. This is helpful with some astigmatic patterns, particularly post-LASIK patterns. By totaling data from 600 individual ray tracings through the central 3-mm zone, it gives a best-fit K reading that is quite often different from the traditional K reading from a single 3-mm ring. Knowing this information is important if a multifocal IOL is considered, and I have decided against using a diffractive multifocal lens in many cases because of the corneal HOAs measured through a particular patient’s actual pupil size in a dimly lit room.įinally, the iTrace topographer not only provides a traditional 3-mm simulated keratometry (SimK) reading but also maps the refractive keratometry (K). For example, corneal irregularity measured over a standard 6-mm diameter zone may not be problematic with a 2-mm pupil. Additionally, it performs pupillometry and quantifies the HOAs that the patient would see through that specific pupil diameter. Most important, it measures and calculates the higher-order aberrations (HOAs) of the cornea separately from those of the internal optics (eg, the lens). In addition to being a topographer, the iTrace simultaneously performs wavefront aberrometry. There are several useful diagnostic technologies, but one that I find indispensable is the iTrace (Tracey Technologies). How Much Astigmatism Do I Fix With Cataract Surgery? POINT/COUNTERPOINT: DOES INTRAOPERATIVE ABERROMETRY MATTER? Improving Refractive Outcomes With the Verion SystemĬirle: A Digital Tool for Surgical Navigation and GuidanceĬallisto Eye: Seamless Integration With Other ProductsĬassini: Providing True Axis and Magnitude of AstigmatismĪdvancing Cataract Surgery With Diagnostic Technologies Pharmacologic Approach to Presbyopic Correctionĭislocated IOL Levitation With a Sleeveless Extrusion Cannula Advances in Smartphone Photography of the Eye
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