Abstract
Purpose :
To assess reliability of intraocular lens (IOL) calculation using “Barrett True K” in patients with radiated keratotomy (RK).
Methods :
Prospective, observational. Conducted in the Anterior Segment department of the Ophtalmology Institute “Fundacion Conde de Valenciana”. Patients with RK and cataract diagnosis were included between September 2017 to October 2019. IOL calculation was carried out using “Barrett True K” with a -0.50 target of spheric equivalent (SE). The dioptric power of the implanted IOL was the closest suggested by Barrett True K. Refraction was obtained 1 month posterior to surgery. IOL Prediction Error (IOL PE) was calculated substracting the power indicated by Barret True K to the implanted lens power and then the refractive predictive error (RPE) was calculated assuming that 1 diopter (D) of IOL PE corresponded to 0.7 D in aerial lenses.
Results :
24 eyes were included . 77.8% were women, the rest men with a 14.3%. Median age was 60.4 years. 57.1% were right eyes and 42.9% left. Average axial length was 24.19 ± 1.61. The median of radiated cuts was 8.5. The median flattest keratometry was 34.9 ± 3.9, and the steepest was 36.4 ± 3.33. The median D of the lens implanted was 20.575. The month after the surgery a median residual ametropy of 0.7 D and ± 1.02 D of SE were found. Best corrected visual acucity was 0.21 LogMAR. The median IOL PE was calculated of 0.30 ± .17 and the median RPE was of 0.21 ± .12. 42% of the eyes had a RPE of +-0.50 D and 58% a RPE de +-1.00 D. 64.3% had a residual SE ≤ 0.50 D.
Conclusions :
Barret True K was precise in predicting a refractive error of ± 1.00 D in approximately 65% of the eyes, it proved to be effective in 9 out of 14 cases.
This is a 2021 ARVO Annual Meeting abstract.