ESCRS - PO456 - Analysis Of The Phakic Eye Regarding Biometric Ratios And The Effect On Iol Power Calculation

Analysis Of The Phakic Eye Regarding Biometric Ratios And The Effect On Iol Power Calculation

Published 2025 - 43rd Congress of the ESCRS

Reference: PO456 | Type: Free paper | DOI: 10.82333/k64n-h815

Authors: Hardik Parikh* 1

1ophthalmology,global eye clinic,mumbai,India

Purpose

To investigate the influence of biometric ratios of the phakic eye with regard to intraocular lens (IOL) power calculation

Setting

Department of Ophthalmology and Optometry, Kepler University Clinic, Linz, Austria

Department of Ophthalmology and Optometry, Johannes Kepler University, Linz

Methods

This study included patients that underwent standard preoperative cataract surgery assessment. Preoperative measurements included optical biometry (IOLMaster700, Carl Zeiss Meditec AG, Germany) and anterior segment optical coherence tomography (AS-OCT) (Casia2, Tomey, Japan). Biometric data (anterior chamber depth (ACD); axial eye length (AL); central corneal thickness (CCT); lens thickness (LT)) were used to analyze the anatomical relationships (i.e. ratios of biometric parameters). Statistical analysis was performed using SPSS (IBM, USA).

Results

A total of 2499 phakic eyes of 2499 patients were included. An average ratio for CCT/AL of 0.020±0.002, ACD/AL of 0.128±0.015, LT/AL of 0.157±0.016 and vitreous/AL of 0.695±0.022 was found. A significant difference in the ratios of CCT/AL, LD/AL, V/AL between the subgroups of short (<22.00mm), normal (22.00-25.99mm) and long (>26.00mm) eyes as well as an intergenerational shift was observed. There was a significant correlation of AL with ACD (r=0.487; p<0.01); LT (r=-0.264; p<0.01) and age (r=-0.244; p<0.01).

 A detailed analysis and the effect on IOL calculation will be presented at the meeting.

Conclusions

There was an intergenerational and axial length-related shift in anatomical relationships. Not only AL, but also a deviation of the different ratios within the eye could lead to errors in the artificial lens calculation. In the future, precise knowledge of the ratios could be useful when performing IOL power calculation.