Investigation Of Short-Term Variability Of Ocular Biometric Measurements Before Cataract Surgery
Published 2024 - 42nd Congress of the ESCRS
Reference: PP05.03 | Type: Free paper | DOI: 10.82333/njmj-8w25
Authors: Sanghyuk Ahn* 1 , Youngsub Eom 2 , Jong Suk Song 3 , Hae Jung Paik 4 , Dong Hyun Kim 1
1Department of Ophthalmology,Korea University College of Medicine,Seoul,Korea, Republic Of, 2Department of Ophthalmology,Korea University Ansan Hospital,Ansan,Korea, Republic Of, 3Department of Ophthalmology,Korea University Guro Hospital,Seoul,Korea, Republic Of, 4Department of Ophthalmology,Gachon University College of Medicine, Gil Medical Center,Incheon,Korea, Republic Of
Purpose
To investigate the short-term variability of ocular biometric measurements and analyze the associated factors in high variability.
Setting
Department of Ophthalmology, Korea University Anam Hospital, Seoul, Republic of Korea.
Methods
This retrospective study included 60 eyes of 60 patients, who underwent ocular biometric measurements twice with the IOLMaster 700 (Carl Zeiss Meditec, AG, Jena, Germany) before cataract surgery between March 2023 and November 2023. Ocular surface parameters included tear film break-up time (TBUT) and corneal and conjunctival staining scores before cataract surgery. The absolute difference between the two ocular biometric measurements was evaluated and factors affecting the variability of measurements were assessed. Refractive surprise, defined as Mean Absolute Error (MAE) > 0.5D, was analyzed.
Results
Axial length (AL) and anterior chamber depth (ACD) showed high consistency between the two measurements. However, the absolute difference of K values and astigmatism amount showed notable variability (mean K: 0.18±0.17D / astigmatism amount: 0.21±0.26D). A shortened TBUT and increased corneal staining score were significantly associated with high variability of Mean K (≥ 0.25D) respectively (p=0.040 and p=0.008). High K variability group (mean K ≥ 0.25D) revealed a higher incidence of refractive surprise (45.4%) compared to low K variability group (mean K < 0.25D) (17.7%) (p=0.037).
Conclusions
K values showed high variability compared to AL and ACD in short-term repetitive ocular biometric measurements. Preoperative lower TBUT and higher corneal staining score affected the variability of K values and postoperative refractive surprise in cataract surgery.