Corneal Epithelial Thickness Profile in Healthy Portuguese Children by High-Definition Optical Coherence Tomography
Received 26 November 2020
Accepted for publication 25 December 2020
Published 24 February 2021 Volume 2021:15 Pages 735—743
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 2
Editor who approved publication: Dr Scott Fraser
Tomás de Oliveira Loureiro, Sandra Rodrigues-Barros, Diogo Lopes, Ana Rita Carreira, Filipe Gouveia-Moraes, Ana Vide-Escada, Nuno Patricio Campos
Ophthalmology Department, Hospital Garcia de Orta, Almada, Portugal
Correspondence: Tomás de Oliveira Loureiro
Ophthalmology Department, Hospital Garcia de Orta, Avenida Torrado da Silva, Almada, 2805-267, Portugal
Tel +351 913 513 175
Introduction and Objective: To evaluate corneal epithelial thickness (ET) and corneal thickness (CT) profiles in healthy eyes of Portuguese children and provide information to establish the first normative Caucasian database for these age group.
Methods: Sixty healthy eyes of 60 children aged between 8 and 18 were evaluated using the Cirrus high-definition optical coherence tomography device. The average ET and CT were assessed using Cirrus Review Software with predefined concentric corneal ring-shaped zones. Specific regions of ET (central, superior, inferior, temporal, nasal, superonasal, inferotemporal, superotemporal and inferonasal) were also assessed. The mean ET, the mean CT and the difference of ET in corresponding octants were compared by gender. Correlations between central epithelial thickness (CET), age and refractive error were evaluated.
Results and Discussion: The average ET was lower in the peripheric zones, whereas the average CT was higher. ET was thinner in the superior area than in the inferior (p< 0.05). ET was thicker in boys than in girls (p< 0.05), but CT did not differ. CET was not correlated with older age or refractive error.
Conclusion: Optical coherence tomography analysis of ET reveals that it is thinner in the periphery, where the CT is thicker. Unlike CT, ET seems to be influenced by gender. ET profile proved to be a useful tool in keratoconus diagnosis and subclinical keratoconus detection in adults. As epithelial changes occur early in the disease and keratoconus is more aggressive in pediatric population, a normative database of ET profile could contribute to enhance early recognition of the disease in this age group.
Keywords: epithelial thickness, AS-OCT, keratoconus, children
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