The Barrett True-K formula in cataract patients undergoing corneal refractive surgery

Authors

Abstract

Objective: Determine refractive outcomes in patients undergoing cataract corneal refractive surgery based on intraocular lens dioptric power calculation with the Barrett True-K formula.
Methods: A pre-experimental before/after study was conducted of 18 patients (31 eyes). Demographic and clinical variables were analyzed. The main output variable was spherical component predictability ± 0.50 D, ± 1.0 D according to axial length.
Results: Mean age was 59.4 years; female sex prevailed (66.7%). Of the patients studied, 77.4% underwent radial keratotomy. Cataract surgery led to notable uncorrected visual acuity improvement (preoperative mean: 0.12; postoperative mean: 0.60). Only 9.7% of the eyes examined had an uncorrected visual acuity of 20/20, whereas 90.3% had 20/40 or more. The number of eyes with a spherical equivalent of ± 0.50 fell as axial length rose (near: 100%; normal: 57.1%; far: 22.7%), unlike ± 0.50 spherical component predictability, which rose from near: 50.0%; normal: 57.1%; far: 63.6%.
Conclusions: The Barrett True-K formula is useful for intraocular lens calculation in patients undergoing previous cataract and corneal refractive surgery.
Key words: Barrett True-K; corneal refractive surgery; intraocular lens calculation.

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Author Biographies

Eneida de la Caridad Pérez Candelaria, Instituto Cubano de Oftalmología "Ramón Pando Ferrer". La Habana

Especialista de 2do grado en Oftalmología. Máster en enfermedades infecciosas. Profesor Auxiliar. Iinvestigador Auxiliar. Jefe de Centro de Microcirugía Ocular. Jefe de Servicio de Catarata.

Edgar Iván Cangrejo Forero, Instituto Cubano de Oftalmología "Ramón Pando Ferrer". La Habana

Especialista de 1er Grado en Medicina General y Especialista de 1er. grado en Oftalmología

Zucell Ana Veitía Rovirosa, Instituto Cubano de Oftalmología "Ramón Pando Ferrer". La Habana

Especialista de 2do grado en Oftalmología. Máster en enfermedades infecciosas. Profesor Auxiliar. Iinvestigador Auxiliar.

Melany Álvarez Pérez, Universidad de Ciencias Médicas de la Habana.

Estudiante de 2do. año de medicina. Universidad de Ciencias Médicas de la Habana

Taimi Cárdenas Díaz, Instituto Cubano de Oftalmología "Ramón Pando Ferrer". La Habana

Especialista de 2do en Oftalmología. Profesor e investigador Titular. Doctora en Ciencias.

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Published

2021-05-29

How to Cite

1.
Pérez Candelaria E de la C, Cangrejo Forero EI, Veitía Rovirosa ZA, Pérez M Álvarez, Díaz TC. The Barrett True-K formula in cataract patients undergoing corneal refractive surgery. Rev Cubana Oftalmol [Internet]. 2021 May 29 [cited 2025 Apr. 21];34(2). Available from: https://revoftalmologia.sld.cu/index.php/oftalmologia/article/view/1046

Issue

Vol. 34 No. 2 (2021): abril-junio

Section

Investigaciones

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