Clinical experience with the Tracey technology wavefront device

PURPOSE: In refractive surgery, measuring the total ocular profile of refra ction gives more vital information than measuring the cornea alone. We repo rt the first clinical experiments with spatially resolved refractometry usi ng ray tracking principles. Tracey technology was developed in Ukraine by t he Institute of Biomedical Engineering in cooperation with the Vardinoyanni on Eye Institute of Crete. METHODS: The Tracey-1 device was evaluated in comparison with conventional videokeratoscopes. Seven. pseudophakic eyes of 7 patients and two phakic ey es were measured thirty (30) consecutive times (consecutively) each to test reproducibility. Measurements were provided in zones 0 to 5 (6) mm. For ea ch zone, parameters of astigmatism were calculated and mean value and stand ard deviation were derived. RESULTS: Standard deviation on the order of 0.14 D was derived. CONCLUSION: The Tracey Technology wavefront device provides information on the refraction distribution at the first principal plane of the ocular opti cal system. For the instrument to provide measurements that are directly ap plicable to clinical practice, the data should be transposed to the corneal plane. The Tracey device can be utilized for the measurement of accommodat ive amplitude and range. Further development of the instrument is requred t o increase its accuracy.