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Arquivos Brasileiros de Oftalmologia

Print version ISSN 0004-2749On-line version ISSN 1678-2925


CORREA, Zélia Maria da Silva et al. Biometric accuracy of the SRK/T formula in phacoemulsification. Arq. Bras. Oftalmol. [online]. 2001, vol.64, n.3, pp.233-237. ISSN 1678-2925.

Purpose: To determine the accuracy of intraocular lens (IOL) power calculation with the SRK/T formula in phacoemulsification. Methods: Retrospective review of 119 patients treated with phacoemulsification in 1999 in a University Hospital. Patients with incomplete charts and with intraoperative complications were excluded from this study. Eighty-one patients were selected to establish the accuracy of the SRK/T formula to predict the postoperative refractive error after phacoemulsification and intraocular lens implantation. All biometries were performed by the same technician using the same equipment. All procedures were performed by third-year residents. Results: Comparing the final refraction planned by the surgeon, based on biometry with the SRK/T formula, and the postoperative spherical equivalent, patients were divided in to 4 groups: Group 1 - patients with refractive errors up to ± 0.50 diopters (n=33 (40.7 %)). Group 2 - patients with refractive errors between ±0.51 and ±1.25 diopters (n=29 (35.7 %)). Group 3 - patients with refractive errors between ±1.26 and ±2.00 diopters (n=8 (9.87%)). Group 4 - patients with refractive errors above ±2.01 diopters (n=11 (13.5%)). Conclusions: The postoperative refractive results were satisfactory, the majority of patients (n=62 (76.4%)) presented residual refractive errors after phacoemulsification up to ±1.25 diopters.

Keywords : Biometry; Intraocular lens implantation; Ocular refraction; Methods; Postoperative period; Phacoemulsification; Refractive errors.

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