Problems of Intraocular Correction in Patients after Radial Keratotomy
https://doi.org/10.18008/1816-5095-2026-2-259-267
Abstract
Widespread use of radial keratotomy (RKT) at the end of the last century determined numerous difficulties in planning intraocular correction in this group of patients associated with the calculation of the optical power of the intraocular lens (IOL), the choice of the type of intraocular correction and the specifics of surgical intervention. Postkeratotomic deformations are usually accompanied by irregular changes in the anterior and posterior surfaces of the cornea, and, despite the advent of new calculation formulas, make the refractive result difficult to predict. Modern research methods allow a detailed analysis of keratotopographic parameters in complex clinical situations when determining indications for implantation of toric IOLs. At the same time, a wide range of IOLs of various types and designs, with functionality of obtaining vision at different distances, allows not only implantation of monofocal IOLs, but requires systematization of existing knowledge, in relation to patients with complex corneal surface relief. Recommendations for implantation of multifocal IOLs (MIOLs) are in most cases of a cautionary nature due to the peculiarities of image formation when using the diffraction design of the optical part. The principle of splitting the light flux, accompanied by a high probability of photopic phenomena and potentially affecting the indices of contrast sensitivity, in combination with the difficulty of predicting the achievement of target refraction are among the main limiting factors. The group of lenses with extended depth of focus is free from many of the disadvantages of MIOLs, but also needs to be studied in patients with RKT. Thus, the question of choosing the type of optical correction is directly determined by a number of factors, the consistent study of which is of great practical importance for determining the optimal strategy when planning intraocular correction in patients with a history of RKT.
About the Author
N. S. Timofeyeva
Cheboksary Branch of the S. Fyodorov Eye Microsurgery Federal State Institution
Russian Federation
Russian Federation
Timofeyeva Nina S. - PhD, head of the operating unit
Traktostroiteley ave., 10, Cheboksary, 428028
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For citations:
Timofeyeva N.S. Problems of Intraocular Correction in Patients after Radial Keratotomy. Ophthalmology in Russia. 2026;23(2):259-267. (In Russ.) https://doi.org/10.18008/1816-5095-2026-2-259-267
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