Visual Outcomes Following Premium Iol Implantation Using Immersion Biometry

To analyze the Visual outcomes following Premium IOL (Intraocular lens) implantation using Immersion ultrasound Biometry

This is a retrospective study done at a peripheral eye care centre in Southern India. The study included patients with senile cataract who had undergone uneventful cataract surgery with implantation of Monofocal toric / Multifocal / Multifocal Toric IOL   between January of 2023 to September 2023.

The study included patients with senile cataract who had undergone uneventful cataract surgery with implantation of Monofocal toric / Multifocal / Multifocal Toric IOL   between January of 2023 to September 2023. Keratometry was performed with the Bausch and Lomb Keratometer by an experienced technician. Axial length measurement was done using the ultrasound A-scan biometer. The data were entered into the online Barrett formula (calc.apacrs.org).In patients planned for the Toric monofocal or Toric Multifocal IOL, Barrett Toric calculator was used to calculate the respective toric IOL using the Predicated PCA (Posterior Corneal Astigmatism).  Phacoemulsifcation was done for all patients, post op evaluation was done at 1 and 6 weeks. 

A total of 130 patients (154 eyes) were included in the study.76 patients (89 eyes) underwent monofocal Toric IOL, 34 patients (41 eyes) had multifocal IOL implantation and 20 patients (24 eyes) had multifocal toric IOL implantation. Mean age of the patients was 62 ± 10 years. The mean post operative spherical equivalent in patients who had Toric Monofocal IOL was 0.15±0.25D; 0.10±0.15D in Multifocal Toric and 0.08±0.18 D in Multifocal IOL. The mean absolute error and median absolute error for the monofocal toric iol’s was 0.23 and 0.22 and for the multifocal IOL was 0.18 and 0.13.The predicted refraction error of ±0.50D was 83% in monofocal toric iol’s and 95.4% in multifocal iol implantation group

 These results are quite encouraging and reinforces the fact that doing a good quality immersion biometry can yield very good post op results with Premium IOLs, especially in a developing country like ours where the cost of procuring an Optical biometer would be quite challenging for newer practitioners and beginner surgeons who would want to cater to a population demanding premium IOL’s. In challenging eyes due to extremes of axial length and with prior history of corneal or retinal procedures, Immersion A scan does have a limitation and has to be used with caution.