Intérêt de la formule Holladay 2 dans le calcul de la puissance de l’implant intraoculaire pour les yeux de biométrie hors normes

Abstract

To evaluate the benefit of the Holladay 2formula versus the 3rd generation formulae in calculating the IOL power in eyes with non-standard axial length or keratometry before cataract surgery. Retrospectiv study from January to December 2015. The inclusion critaeria were axial length (AL) <22mm or >26mm, or average keratometry <42D or >46D, dividing the patients in 4groups respectively. The 7parameters required to calculate the Holladay 2formula were collected. The final refractive result was turned into spherical equivalent to calculate the optimal power retrospectively. Then, the results obtained using the other formulae were compared with the optimal IOL power. One hundred and twenty-six eyes operated by two surgeons were included. In the high AL group (n=32), the SRK/T was the most accurate formula; regarding the low AL group (n=36), the Hoffer Q and Holladay 2formulae performed better; for the steep cornea group (n=27), the Hoffer Q, Haigis, Holladay 1and 2formulae were not different; last, the Holladay 1and 2were more accurate in the flat cornea group (n=33). In our study, the Holladay 2formula does not seem to be better than the others for calculating IOL power in non-standard eyes. Preoperative eye features in such non-standard cases should be taken into account before the surgery to choose the more suitable formula.