ESCRS - PO825 - Comparison Of Corneal Parameters In Early Keratoconus, Suspected Keratoconus And Normal Thin Corneas

Comparison Of Corneal Parameters In Early Keratoconus, Suspected Keratoconus And Normal Thin Corneas

Published 2024 - 42nd Congress of the ESCRS

Reference: PO825 | Type: Poster | DOI: 10.82333/34ab-vg42

Authors: Tuna Ozan Dogan* 1 , Burcu Kemer Atik 2

1Ophthalmology,Şehit Prof.Dr. İlhan Varank Training and Research Hospital,Istanbul,Türkiye, 2Ophthalmology,Beyoglu Eye Training and Research Hospital,Istanbul,Türkiye

Purpose

This study aims to compare topographic parameters and higher-order aberration values in early keratoconus (KC), suspected KC, and normal thin corneas.

Setting

The medical records of patients with early KC, suspected KC, and thin corneas, who were followed up in the cornea unit at Beyoglu Eye Training and Research Hospital, were retrospectively examined. 

Methods

The study included 139 eyes of 89 patients, categorized into three groups: early KC (Group 1- 45 eyes), suspected KC (Group 2- 50 eyes), and normal thin cornea (Group 3- 44 eyes). Corneal keratometric indices (Sim-K1, Sim-K2, corneal astigmatism, central corneal thickness (CCT), anterior and posterior elevation (Kvf and Kvb)), higher-order aberration, uncorrected and best-corrected visual acuity (BCVA), and autorefractometer (ARF) values (spherical, cylindrical, and spherical equivalent) were compared between the groups.

Results

Group 1 had significantly higher Sim K1 and K2 values compared to 2 and 3 (p<0.05).Corneal astigmatism values exhibited statistical similarity across groups(p=0.99).CCT was significantly lower in Group 1 compared to 2 and in Group 2 compared to 3 (p=0.002, p=0.120).Kvf and Kvb values were significantly higher in Group 1 than 2 and in Group 2 than 3 (p<0.001).Coma,trefoil,secondary astigmatism and total RMS values were higher in Group 1 than 2 and in Group 2 than 3 (p<0.05).BCVA similarity between the groups with no significant difference (p=0.99).No significant differences were in spherical and spherical equivalent ARF values between the groups (p=0.97).However cylindrical ARF values were significantly higher in Group 1 than Group 3(p=0.03)

Conclusions

For the determination of ectasia in thin corneas, a detailed topographic examination and evaluation of aberrations are crucial rather than relying on corneal thickness and astigmatism values.