Comparison of Central Corneal Thickness by Ultrasound Pachymetry and Anterior Segment Optical Coherence Tomography

Le résumé fourni par la source

Background and Aim: Corneal thickness measurement is essential in evaluation before refractive surgery as well as in glaucoma. Ultrasound pachymetry (USP) is the gold standard technique for measuring corneal thickness. Several noncontact techniques such as orbscan, anterior segment optical coherence tomography (ASOCT) and pentacam also provide corneal thickness. The study aimed (1) To compare central corneal thickness (CCT) by USP with that obtained by ASOCT in young adults. (2) To study the relationship of CCT with refractive status and body mass index (BMI). Materials and Methods: It was a cross-sectional comparative study in a tertiary hospital. The study was done in healthy young adults between 18 and 40 years. BMI, refractive status was assessed. CCT was measured using ASOCT and USP by single observer. For the study, only right eye of the participant was chosen. Pearson correlation coefficient was used to assess the strength of correlation between CCT measurements by two instrument and to analyze the correlation between CCT and BMI, and CCT and refractive error. Results: The study included 104 eyes of 104 subjects of which 62 (59.6%) were female and 42 (40.4%) were male. The mean CCT in microns by pachymetry was 530.36±33.23, while by ASOCT was 536.37±39.08. Pearson’s correlation analysis was used to assess the strength of correlation between the measurements. The r -value was found to be 0.828 ( P < 0.001) which indicated that the two methods were comparable. The Bland–Altman plot showed good agreement between the two instruments. Pearson’s correlation showed no correlation of CCT with BMI and refractive error. Conclusion: The study showed that CCT obtained by two devices were comparable and there was no correlation of CCT with refractive status or BMI.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.