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.

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