Validation And Evaluation Of Corneal Changes Associated To Accommodative Variations With Scheimpflug Imaging-Based Tomography: A Potential Indirect Analysis Of Corneal Biomechanics
Published 2023 - 41st Congress of the ESCRS
Reference: PP12.13 | Type: Free paper | DOI: 10.82333/kyj2-3032
Authors: David Pablo Pinero* 1 , Farid J Bedrán-García 1 , Alfonso Arias-Puente 2
1University of Alicante,Alicante,Spain, 2Ophthalmology,Vithas Medimar International Hospital,Alicante,Spain
Purpose
To evaluate preliminarily with the new accommodation configuration mode of a Scheimpflug imaging-based system the corneal changes occurring with accommodation in healthy eyes with different refractive errors
Setting
Optometric Clinic, University of Alicante, Alicante, Spain
Methods
Prospective, non-randomized, comparative study including 54 eyes of 27 healthy subjects, with spherical refraction between -6.00 and +6.00 D, and cylinder below 1.50 D. In all cases, a complete eye exam was performed, including the analysis of corneal changes with different accommodative stimuli (+2.00, 0.00 and -3.00 D) using the Pentacam AXL® system (Oculus Optikgerate). The investigation was structured in 2 phases: repeatability analysis and characterization of accommodation-related corneal changes in a healthy population.
Results
In the repeatability analysis, the height asymmetry index (IHA) showed the greatest variability with the three accommodative stimuli, being the results for the rest of parameters acceptable. The group of emmetropes showed significant differences with accommodative changes in the position of maximum keratometry (Kmax) (p=0.025), whereas in the astigmatic group, significant changes were not only observed in the position of Kmax (p=0.004), but also in minimum corneal thickness (MCT) (p=0.038), corneal spherical aberration (p=0.006), and total (p=0.046) and low order aberration root mean square (p=0.046). Likewise, a significant difference was found in the displacement of the X position of Kmax with +2 and -3 D in the myopia group (p=0.033).
Conclusions
The results of our study suggest that there are significant differences in the corneal response to different accommodative stimuli between subjects of different refractive errors using the Accommodation mode of the Pentacam system. Likewise, the consistency of the measurements obtained with this tool has been confirmed.