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W. Simawi, P.G. Söderberg, C.–G. Laurell, P. Nordqvist, L. Nordh, E. Skarman; Cataract Surgery Simulator, Development of Software for Treatment Parameters and Measurement Variables . Invest. Ophthalmol. Vis. Sci. 2005;46(13):742.
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Purpose: To develop software for determination of treatment parameters and measurement variables for a cataract surgery simulator. Methods: We have developed a cataract surgery simulator that allows virtual phacoemulsification cataract extraction under input from a phacoemulsification hand piece, a nuclear manipulator, a foot pedal for microscope X–Y–Z and zooming and a foot pedal for irrigation, aspiration and phacoemulsification control and visual feed back through a 3D binocular microscope. In this study, we defined relevant treatment parameters and surgical procedure measurement variables. A group of experienced cataract surgeons were questioned about relevant treatment parameter and measurement variables. The suggestions were carefully examined by our development group and the most important parameters and variables were implemented in the simulator software. Results: Procedure parameters were affiliated to the main groups; patient movement, pupil diameter, lens parameters and phacoemulsification procedure parameters. In each group, about 10 parameters were identified. A windows based administrator interface was developed to set the procedure parameters. One combination of setting of procedure parameters was made possible to save as a case for fast initiation of a similar simulator session. Measured variables were affiliated to the main groups; procedure characteristics, foot pedal technique, phacoemulsification technique, erroneous manipulation, damage to ocular structures, and trainee physiological variables. In each group about 10 variables were identified. At initiation of a simulator session a txt file is created and all session parameters are stored on the file and during and after the session all estimates of measured variables are stored on the txt file for further analysis. Conclusions: The simulator that we have developed now allows to customize a specific surgical case and to measure the performance of the trainee during the virtual cataract surgery. This will allow clinical evaluation of the simulator.
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