![]() ![]() iTrace data can be exported to an external software to independently calculate refraction, refractive maps and visual performance metrics. Trial lens calibration showed that small variation in refraction can be reliably detected with iTrace. ITrace is a reliable instrument for measuring refraction in pseudophakic eyes. True Ray Tracing powers the iTrace to measure through almost any eye with more. Trial lens calibration showed linear change in refraction (r 2 > 0.98) in 61 out of 62 eyes. THE ITRACE PROVIDES YOU WITH BETTER INFORMATION. Objective iTrace and subjective spherical equivalent refractive error correlated very well in all pseudophakic eyes (slope = 0.99 and intercept = 0.12 r 2 = 0.81). The wavefront and refraction maps generated by iTrace could be exactly replicated externally with the custom Matlab software. Combining total-eye ray tracing wavefront with placido-ring corneal topography, it separately provides information about aberrations from the anterior corneal surface, and those caused by internal optics. ITrace measured and externally calculated refraction correlated very well (slope = 1.0 and intercept = 0.0 r 2 = 1.0). The iTrace is a device that supports ophthalmologists with ophthalmic diagnosis and subsequent surgical correction of vision. Additionally, refraction with +1D and -1D trial lenses placed in front of the eye was measured as a calibration procedure to evaluate the linearity of iTrace measurements. ![]() All objective measurements were performed for a 3 mm pupil. Tracey Technologies develops vision analysis and diagnostic devices for ophthalmologists, eye surgeons, and doctors. Trial registration: This is a retrospective. The externally calculated sphero-cylindrical refraction was compared to iTrace measured refraction and subjective refraction. The combination of OQAS and iTrace analyzer is a valuable complementary measurement in evaluating the optical quality after the refractive surgery. iTrace sphero-cylindrical refraction was externally calculated by exporting Zernike coefficients to a custom software in Matlab. Monocular subjective and objective iTrace refraction were performed under cycloplegia in sixty two (62) pseudophakic eyes including 15 subjects with a standard monfocal IOL and 16 subjects with the Synchrony Dual Optic Accommodating IOL. This study was designed to evaluate the performance and expand the scope of a common aberrometer (iTrace, Tracey Technologies, Houston) in measuring refraction in pseudophakic eyes. The optical design of an IOL including refractive index, surface curvatures and optic diameter together with small pupils (4mm or less) in elderly patients may influence the performance of aberrometers. The iTrace (Tracey Technologies, Houston, Tx) is uniquely designed to combine Placido corneal topography with a ray tracing aberrometer to measure quality of vision in a patient. Aberrometers are becoming increasingly popular to understand the overall optical characteristic of a pseudophakic eye. The advent of novel intraocular lenses (IOLs) such as multifocal, aspheric and accommodative IOLs has brought a need to reliably measure refraction and ocular aberrations in pseudophakic patients.
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