ESCRS - PO437 - The 10000 Eyes Study: Analysis Of Keratometry, Abulafia-Koch-Regression, And Biometric Eye Parameters Obtained With Swept Source Oct

The 10000 Eyes Study: Analysis Of Keratometry, Abulafia-Koch-Regression, And Biometric Eye Parameters Obtained With Swept Source Oct

Published 2022 - 40th Congress of the ESCRS

Reference: PO437 | Type: Free paper | DOI: 10.82333/nfc0-vm84

Authors: Sophia Anna Reifeltshammer* 1 , Jascha Wendelstein 1 , Matthias Bolz 1 , Nino Hirnschall 1

1Department for Ophthalmology and Optometry,Kepler Universitätsklinikum,Linz,Austria;Medical Faculty,Johannes Kepler University,Linz,Austria

Purpose

To analyze Abulafia-Koch-Regression (AKRT), anterior and posterior astigmatism (K and TK), and evaluate biometry data in a large population.

Setting

Multicenter (two tertiary care centers)

Methods

Retrospective data analysis. Data sets acquired between 2017 and 2020 were analyzed. Axial length (AL), corneal front and back radii(including meridians for K and TK conversion), horizontal corneal diameter (W2W), anterior chamber depth (ACD), lens thickness (LT), central corneal thickness were measured using telecentric keratometry and swept source OCT based biometry (IOLMaster700). Cooke-modified axial length (CMAL) and AKRT were calculated. Difference vectors (DV) between K and TK astigmatism and between AKRT and TK astigmatism were compared.

Results

A total of 10300 eyes of 6388 patients were assessed. DVs for K and TK were significantly smaller than for AKRT and TK. K measurement showed a configuration of 51.49% of WTR and 30.51% ATR, TK measurement showed a configuration of 41.60% of WTR and 40.21% ATR. Mean total astigmatism was -0.94±0.74 dpt. Mean values for AL and CMAL were 23.70±1.39 mm and 23.70±1.34 mm respectively. Anterior chamber depth, LT, W2W, AL, and age were all correlated with each other. 

Conclusions

Astigmatism analysis showed less difference between K and TK than between AKRT and TK. There were significantly less eyes with WTR and more eyes with ATR astigmatism configuration in TK than in K derived keratometry. The study provides data on gender and generational differences in biometry. Significant intersexual differences in AL and CMAL were observed, with CMAL providing lower SD compared to AL.