Refractive outcome of intraoperative aberrometry in predicting intraocular lens power in short eyes and comparing it with optical biometry
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First Author: A.Jain INDIA
Co Author(s): M. Bansal G. Gupta C. Malhotra R.
To evaluate the accuracy of intraoperative aberrometry [IOA] in IOL power calculation [for only one type of IOL plate form] and compare it with conventional IOL power calculating formulae: 3rd generation (SRK/T and Hoffer Q); 4th generation (Haigis, Holladay II) and fifth generation (Barrett universal II, Hill RBF) formulae, which were derived using preoperative biometry.
Tertiary care Centre, Cataract and Refractive Services of Advanced Eye Centre, PGIMER, Chandigarh, INDIA.
In this prospective study 65 eyes of 57 patients, with axial length less than 22.0mm, underwent phacoemulsification with IOA (ORA, Alcon Laboratories, Inc.) assisted IOL implantation between Jan 2018 to June 2019. All surgeries were performed by a single surgeon (AKJ). Preoperative optical biometry was performed using partial coherence interferometry (PCI) (ZEISS IOLMaster 700, Carl Zeiss, Jena, Germany) and then intraocular lens power was calculated using following IOL power calculating formula : (1) SRK/T (2) Hoffer Q (3) Haigis (4) Holladay II (5) Barrett Universal II. Hill RBF was calculated through online calculator. Postoperative refraction was noted at 1 month.
Mean absolute prediction error with IA was 0.374 ±0.346D. Hyperopic shift with IOA was 46.15%. Outcomes within ±0.5D of target in IOA was 67.69% which was superior to SRK-T (63.08%);Barrett (60.00%);Holladay-II (53.85%);Haigis (50.77%), but was inferior to Hill-RBF (70.77%) and Hoffer-Q (69.23%). Outcome within ±1D of target in IOA was 95.38% which was superior to Hoffer-Q (93.85%);SRK-T (93.85%);Haigis (84.62%);Hollday-II (80.00%) but was similar to Barrett (95.38%) and inferior to Hill-RBF (96.92%). All these results were statistically significant. Hoffer-Q gives minimum hyperopic shift (30.76%) followed by Hill-RBF (38.46%), Holladay-II (38.46%), Haigis (43.07%) and then IOA.
This is first prospective study with single type of IOL plate form, comparing IOA with other IOL power calculation formulae for calculating IOL power in short eyes. IOA was effective in predicating IOL power in cases of axial hyperopia and was found superior to most of available formulae except Hill-RBF in such cases. Hill-RBF is found to be best available IOL power formula for cases with axial hyperopia.