Abstract
Purpose. To determine IOL deformation in patients after phacoemulsification using optical coherence tomography (OCT) and to identify associated shift of postoperative refraction. Results. A "deflection" along the axis was detected during the OCT data analysis. In 38 cases (17.27 %) the center of the optical part of the lens was shifted toward the retina. The amplitude of this shift was 8.41 ± 8.28 mkm (from 0.00 to 30.00 mkm). At the same time patients with the "deflection" of the optical part of the IOL have large values of axial length (AL) accompanied with a great corneal segment diameter size, a deeper anterior chamber of the pseudophakic eye and its larger volume after IOL implantation. The obtained subjective refraction and the autorefractometry data in the form of a spherical equivalent were compared with the expected value of the calculated refraction using standard formulas. The average amplitude of the refraction shift was 0.25 diopters towards hypermetropia. Mathematical models based of logistic regression were constructed to predict the probability of the lens "deflection". The model based on only IOL power value (AUROC = 0.89 ± 0.07) stood out with good predictive quality and the possibility of interpretation. A high probability of IOL "deflection" was revealed when its power was not greater than ≥ 18.5 diopters. Another models was built based on sets of biometry data measured with Lenstar LS900: the axial length and anterior chamber depth of of the phakic eye, the diameter of the corneal segment and the average keratometry data calculated within the main meridians. This one have also high predictive quality: AUROC = 0.93 ± 0.06. Conclusion. Based on the data of optical coherence tomography, it is possible to detect the axial "deflection" of the optical part of the intraocular lens. The deflection of the IOL is reflected in the hypermetropia refractive shift relative to that calculated by the formulas of Hoffer Q, Holladay I and Haigis, which requires correction. To calculate the probability of displacement of the implanted IOL towards the retina, 2 logistic regression models with good predictive quality and the possibility of interpretation for the have been developed. Keywords: cataract, "deflection" along the axis, phacoemulsification, IOL deformation, optical coherence tomography
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