Purpose:
To compare the accuracy of the Barrett toric calculator with measured and predicted posterior corneal astigmatism (MPCA and PPCA, respectively), the Abulafia-Koch formula (AK), and the toric Kane Formula.
Setting:
Ein-Tal Eye Center, Tel Aviv, Israel.
Design:
Retrospective cohort.
Methods:
Consecutive cases of patients who underwent uneventful cataract extraction surgery with implantation of a toric intraocular lens between March 2015 to July 2019 were retrospectively reviewed. One eligible eye from each patient was included. The predicted postoperative refractive astigmatism was calculated using each method and compared with the postoperative refractive astigmatism to give the prediction error.
Results:
The study included 80 eyes of 80 patients. The mean centroid and the mean and median absolute prediction errors using Kane (0.25D ± 0.54 @ 6°, 0.50D ± 0.31and 0.45D, respectively) were significantly different compared with MPCA (0.12D ± 0.52 @ 16°, p<0.001, 0.44D ± 0.28 and 0.36D, p=0.027, respectively), PPCA (0.09D ± 0.49 @ 12°, p<0.001, 0.41D ± 0.27 and 0.35D, p<0.001, respectively) and AK (0.11D ± 0.49 @ 11° p<0.001, 0.42D ± 0.27 and 0.35D, p=0.004, respectively). No significant differences were found between the calculators in the predictability rates within 0.25D 0.50D, 0.75D, and 1.00D.
Conclusions:
The measured posterior corneal curvature in the Barrett calculator yielded comparable outcomes to its prediction by the Barrett and AK formulas. The Kane calculator showed a slight against-the-rule prediction error compared with the other methods, resulting in a small higher median absolute error with marginal clinical importance.
