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Position of posterior capsule of pseudophakic eye after implantation of volume-changing IOL with “torsion” haptic MIOL-28


Determining the exact position of the IOL in the eye is an essential parameter for calculating IOL optical power, especially in the new lens models. Over the years, we have implemented development and learning of volume-changing IOL based on a flexible plate torsion haptic – Plate Torsion Haptic Intraocular Lens (PTHIOL). The implant is designed to be stretching the lens capsular bag (CB) by its flexible haptics in the direction of the native lens equator, and in the anterior-posterior direction with maximal close approach of optical part to posterior lens capsule (PLC). In this regard, we made the study of PLC position changes by UBM-biometry method in 53 patients (53 eyes) with cataract before and after PTHIOL of model MIOL-28 implantation. We took measurements of the distance from the corneal vertex to PLC on perpendicular. This option was considered as a biometric lens position (BLP). Its absolute value and the difference of pre- and postoperative values were analyzed. As a result, the possibility of determining PLC position by preoperative UBM-biometry to predict postoperative position of MIOL-28 was clinically justified. An average value of the BLP of PTHIOL, demonstrating its sufficient approach to the preoperative PLC position and effective recovery of the anatomic and topographic parameters of the eye, was obtained. The results of the BLP determination for model MIOL-28 allow to outline ways of further improving as methods of BLP prediction based on pre-operative measurement of native lens parameters or PTHIOL designs in terms of optimal recovery of preoperative CB parameters.


plate-torsion haptic intraocular lens (PTHIOL); UBM-biometry; effective lens position (ELP); biometric lens position (BLP)

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617.741.004.1, 617.741-072.7




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