Quantitative in Vivo Assessment of Intraocular Lens Calcification: Correlation Between Optical Coherence Tomography Opacity and Straylight Measurement: In Vivo Assessment of IOL Opacification using OCT.

Purpose: To quantitatively assess intraocular lens (IOL) calcification using anterior segment optical coherence tomography (AS-OCT) and correlate findings with straylight measurements in patients with homogenous IOL calcification.

Setting: Department of Ophthalmology, Heidelberg University Hospital, Heidelberg, Germany.

Design: Prospective, observational clinical study.

Methods: Healthy patients with homogenous IOL calcification underwent AS-OCT imaging with the ANTERION, with IOL opacity being automatically quantified using a custom image-analysis script. Straylight was assessed using the C-Quant straylight meter. Correlation between IOL opacity and straylight was analyzed using Spearmans' rho coefficient.

Results: 35 eyes of 35 patients (mean age 72.9 ± 7.8 years) were included. Mean IOL opacity was 69.15 ± 13.55 pixel intensity units (PIU) and mean straylight was 2.24 ± 0.38 log(s). A statistically significant correlation was found between IOL opacity and straylight with rho = 0.494, p = 0.003. Following linear regression model was established: straylight = 0.0569 × OCT opacity [log(s)] - 1.69 with R 2 = 0.244. Of the 35 eyes, 17 underwent IOL exchange surgery, with a mean IOL opacity of 75.69 ± 7.58 PIU and mean straylight of 2.33 ± 0.30 log(s).

Conclusion: AS-OCT can quantitatively assess IOL calcification in vivo, with results correlating significantly with straylight measurements. This technique may serve as a valuable diagnostic tool for evaluating IOL opacification and assist in surgical decision-making, particularly in borderline cases.