IOL power calculation using the developed technology for surgical treatment of cataracts complicated by a severe adhesive process in noninfectious uveitis

Backgraund: Modern uveal cataract surgery technologies allow for high functional results. Recently, refractive performance requirements have increased, and calculating the optical power of intraocular lenses (IOLs) is a pressing issue, as new technologies require different positioning. Aim: To determine the correction value for the IOL power calculation formula in uveal cataract surgery using the developed technology. Materials and methods: Two groups of patients underwent cataract surgery complicated by severe adhesions using the developed technique. All patients underwent anterior segment optical coherence tomography preoperatively and three months later to assess anterior chamber depth, iris-to-IOL distance, and IOL position. IOL power was calculated using the Holladay II formula. In the study group, a correction of -0.6 diopters (D) toward the myopic side was applied to the planned spherical equivalent. Anterior segment structures, IOL position, and refractive error were assessed three months after surgery. Results: In the study group, the refractive error was negative, amounting to -0.16+0.07 D. In 85% of cases (36 eyes), the achieved refraction was within ±0.5 D of the target, and in 97.5% of cases (39 eyes), it was within ±1.0 D. In the control group, the refractive error was 0.58+0.16 D, indicating a hyperopic shift in the target refraction compared to the planned one. In 27.5% of cases (11 eyes), the postoperative refraction deviated from the target by ±0.5 D, and in 55% of cases (22 eyes), it was within ±1.0 D. Conclusions: The use of a developed technology for cataract surgery complicated by severe adhesions in non-infectious uveitis allows for stable anatomical and topographic results and reduces the risk of recurrent adhesions in the anterior segment. Calculating IOL power using the Holladay II formula (with adjustments) in this group of patients significantly improves refractive outcomes.