Accuracy of intraocular lens calculations in eyes with keratoconus
MMS Vandevenne, VSC Webers… - Journal of Cataract & …, 2023 - journals.lww.com
MMS Vandevenne, VSC Webers, MHM Segers, TTJM Berendschot, D Zadok, MM Dickman…
Journal of Cataract & Refractive Surgery, 2023•journals.lww.comPurpose: To compare the prediction accuracy of the Barrett True-K for keratoconus with
standard formulas (SRK/T, Barrett Universal II, and Kane) and the Kane keratoconus
formula. Setting: Shaare Zedek Medical Center, Jerusalem, Israel, and University Eye Clinic,
Maastricht, the Netherlands. Design: Multicenter retrospective case series. Methods: Eyes
with stable keratoconus undergoing cataract surgery were included. The predicted
refractions were calculated for SRK/T, Barrett Universal II, Barrett True-K for keratoconus …
standard formulas (SRK/T, Barrett Universal II, and Kane) and the Kane keratoconus
formula. Setting: Shaare Zedek Medical Center, Jerusalem, Israel, and University Eye Clinic,
Maastricht, the Netherlands. Design: Multicenter retrospective case series. Methods: Eyes
with stable keratoconus undergoing cataract surgery were included. The predicted
refractions were calculated for SRK/T, Barrett Universal II, Barrett True-K for keratoconus …
Purpose:
To compare the prediction accuracy of the Barrett True-K for keratoconus with standard formulas (SRK/T, Barrett Universal II, and Kane) and the Kane keratoconus formula.
Setting:
Shaare Zedek Medical Center, Jerusalem, Israel, and University Eye Clinic, Maastricht, the Netherlands.
Design:
Multicenter retrospective case series.
Methods:
Eyes with stable keratoconus undergoing cataract surgery were included. The predicted refractions were calculated for SRK/T, Barrett Universal II, Barrett True-K for keratoconus (predicted and measured), Kane, and Kane adjusted for keratoconus formulas. Primary outcomes were prediction error (PE), absolute error (AE), and percentage of eyes with PE±0.25 diopters (D),±0.50 D, and±1.00 D. Subgroup analyses were performed based on the severity of the keratoconus.
Results:
57 eyes were included in the study. The PE was not significantly different from zero for SRK/T, Barrett True-K (predicted and measured), and Kane keratoconus formulas (range 0.09 to 0.22 D, P>. 05). The AE of Barrett True-K predicted (median 0.14 D) and Barrett True-K measured (median 0.10 D) were significantly lower from Barrett Universal II (median 0.47 D) and Kane (median 0.50 D), P<. 001.
Conclusions:
The Barrett True-K formulas for keratoconus had higher prediction accuracy as compared with new generation formulas and a similar prediction accuracy as compared with the Kane keratoconus formula.
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