Which Intraocular Lens Formula From Iolcalculator.Esrcs.Org To Use In Yamane Patients?

Yamane scleral fixation technique offers shorter surgery time and less peri- and post-operative complications in experienced hands. Post-operative final refraction values of the patients who have undergone Yamane scleral fixation surgery is an important parameter in evaluating the success of this technique. The aim of this study is to determine which intraocular lens (IOL) calculator formula from iolcalculator.esrcs.org is the most accurate one for Yamane patients.

This study has a retrospective design.A total of 43 eyes of 40 patients who had Yamane scleral fixation surgery were included in this study. Surgeries were performed by a single surgeon in Ege University between 2023 January and 2024 February.

Barrett Universal 2 and SRK-T formulas were used for IOL power estimation initially. Emmetropia was targeted post-operatively. The IOL power calculations were reperformed according to iolcalculator.escrs.org. The final refraction values 1-month after the surgery were recorded. The absolute values of the difference between the target refraction and the final refraction were used for evaluating the accuracy of IOL power calculation formulas. Analyses were made with IBM SPSS Statistics for Windows, Version 27.0. One-way ANOVA statistical analysis was performed.

Mean age of the patients were 56.51±19.57 years. M/F ratio was 26/14. Main indications for surgery were traumatic IOL dislocation (44%, n=19), followed by aphakia (23%, n=10), traumatic lens dislocation (19%, n=8). Three patients had bilateral Yamane surgery and among them one had a diagnosis of homocystinuria. Mean spherical equivalent of post-op refraction was +0.04 D±1.21. Mean absolute value of deviation from the emmetropia was 0.95±0.73 D. Among the formulas that are available on iolcalculator.esrcs.org, SRK-T and Barrett Universal 2, no significant difference in terms of IOL power calculation accuracy was detected (p=0.982).

Yamane technique is becoming more popular day by day. One of the determinants of a successful surgery in cataract and secondary IOL implantation is the final -refraction of the patient. This study proves that the IOL power formulas that are used while choosing the correct IOL do not differ in terms of an accurate IOL selection. Thus, reaching a final emmetropia depends more on a successful surgical technique rather than the IOL calculation formula that is used.