Retrospective study on the predictability of the Barrett TK Universal II formula using the IOLMaster 700 in a public university hospital across 193 surgeries.

BACKGROUND AND

OBJECTIVE

The refractive outcome is one of the factors that determine the success of cataract surgery. This result depends largely on the calculation of the intraocular lens. Technological advances have enhanced the accuracy of this calculation using high-precision biometers and new biometric formulas. The aim of this study is to evaluate the refractive predictive accuracy of the Barrett TK Universal II formula using IOLMaster 700 technology under real-world clinical conditions in a public university hospital setting.

MATERIALS AND

METHODS

This is a retrospective study performed between October 2021 and February 2023. Biometric variables were recorded using the IOLMaster 700, applying the Barrett TK Universal II formula for the calculation of intraocular lens power. The mean absolute (MAE) and relative (ME) prediction error at three months post-surgery were analyzed, as well as the influence of preoperative variables on the achieved refractive outcome.

RESULTS

One hundred ninety-three patients have been studied, with a mean age of 73.58 ± 9.09 years. The ME was -0.09 ± 0.5diopters (D), and the MAE was 0.39 ± 0.32D. 67.88% of the patients ended up within ±0.5D of the target refraction, and 95.85% within ±1D. No significant correlation was found between the MAE and any of the studied variables.

CONCLUSIONS

The findings support the importance of having precise technology for performing biometrics such as the IOLMaster 700 and the use of last-generation formulas such as the Barrett TK Universal II.