Agreement in retinal nerve fiber layer values and comparison in children using two optical coherence tomography devices

Abstract

Objective: To assess absolute agreement and differences in peripapillary retinal nerve fiber layer (pRNFL) values according to sex, age, laterality, origin and optical coherence tomography (OCT) type in normal pediatric patients undergoing OCT scans using both Cirrus and Spectralis.

Material and methods: Prospective, cross-sectional, and comparative study. We used Spectralis OCT and Cirrus OCT to measure optic disc values of both eyes in one hundred pediatric patients (age 5 to 15years), with no previous ocular pathology or systemic disease that could affect the eye. Due to the similarity between eyes, only right eyes were considered (n=100).

Results: The average peripapillary retinal nerve fiber layer (pRNFL) values were 99.6μm with Cirrus and 106.7μm with the Spectralis system. The four quadrants followed the ISNT rule (inferior-superior-nasal-temporal). The average pRNFL measures correlated negatively with the AL (P<.01) in both OCTs, and the degree of agreement between OCTs for pRNFL and inferior RNFL was moderate (CCI: 0.67 and 0.61, respectively), and low in the rest of the sectors. The average pRNFL values of both OCTs were higher in women than in men (P>.05) and there were also no statistical differences in the pRNFL according to age or laterality (P>.05). All RNFL values were significantly different between both types of OCTs (P<.05) and average pRNFL values were significantly thicker (P<.05) in Latin American than in European children in both eyes.

Conclusions: We suggest that the respective peripapillary RNFL values obtained using these two OCTs should not be considered interchangeable in pediatric patients.

Keywords: Agreement; Disco óptico; Grado de concordancia; Normal pediatric patients; Optic disc; Optical coherence tomography; Pacientes pediátricos; Tomografía de coherencia óptica.