Change of peripapillary retinal nerve fiber layer and choroidal thickness during 4-year myopic progress: Boramae Myopia Cohort Study Report 4

Aims To investigate the longitudinal changes of peripapillary retinal nerve fibre layer (RNFL) and choroidal thickness during myopic axial elongation. Methods Peripapillary RNFL and choroidal thickness were prospectively evaluated by spectral-domain optical coherence tomography (SD-OCT) in 46 eyes of 23 myopic children over the course of 4 years. Using serial OCT images acquired based on a fixed scan circle in the glaucoma progression analysis mode, general and sectoral RNFL thicknesses were acquired at the same position and the angular location of the peak was measured. The peripapillary choroidal thickness likewise was measured at eight positions in serial OCT images. Results The mean age at the baseline was 9.6±1.7 years. The mean axial length increased from 24.80±1.28 mm to 25.64±1.35 mm. The global peripapillary RNFL thickness was 98.54±12.06 µm at baseline. The global and sectoral RNFL thicknesses did not change during the 4 years. The angular location of RNFL peaks was also stable and was located in the superotemporal (64.18±10.85°) and inferotemporal (293.98±11.62°) sectors. The global peripapillary choroidal thickness was 145.40±28.67 µm at the baseline. The global and sectoral choroidal thicknesses did not change during the 4 years. Conclusions The peripapillary RNFL and choroidal thicknesses as well as the locations of the RNFL peaks had been preserved, during the 4-year follow-up on myopic children, when traced and measured from the same location.