OCT Optic Nerve Head Morphology in Myopia IV: Neural Canal Scleral Flange Remodeling in Highly Myopic Eyes
Issued Date
2024-05-01
Resource Type
ISSN
00029394
eISSN
18791891
Scopus ID
2-s2.0-85186473888
Pubmed ID
38311154
Journal Title
American Journal of Ophthalmology
Volume
261
Start Page
141
End Page
164
Rights Holder(s)
SCOPUS
Bibliographic Citation
American Journal of Ophthalmology Vol.261 (2024) , 141-164
Suggested Citation
JIRAVARNSIRIKUL A., YANG H., JEOUNG J.W., HONG S.W., REZAPOUR J., GARDINER S., FORTUNE B.R.A.D., GIRARD M.J.A., NICOLELA M., ZANGWILL L.M., CHAUHAN B.C., BURGOYNE C.F. OCT Optic Nerve Head Morphology in Myopia IV: Neural Canal Scleral Flange Remodeling in Highly Myopic Eyes. American Journal of Ophthalmology Vol.261 (2024) , 141-164. 164. doi:10.1016/j.ajo.2024.01.023 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/97607
Title
OCT Optic Nerve Head Morphology in Myopia IV: Neural Canal Scleral Flange Remodeling in Highly Myopic Eyes
Corresponding Author(s)
Other Contributor(s)
Abstract
Purpose: To compare the prevalence, location and magnitude of optic nerve head (ONH) OCT-detected, exposed neural canal (ENC), externally oblique choroidal border tissue (EOCBT) and exposed scleral flange (ESF) regions in 122 highly myopic (Hi-Myo) versus 362 nonhighly myopic healthy (Non-Hi-Myo-Healthy) eyes. Design: Cross-sectional study. Methods: After OCT radial B-scan, ONH imaging, Bruch's membrane opening (BMO), the anterior scleral canal opening (ASCO), and the scleral flange opening (SFO) were manually segmented in each B-scan and projected to BMO reference plane. The direction and magnitude of BMO/ASCO offset and BMO/SFO offset as well as the location and magnitude of ENC, EOCBT and ESF regions, perineural canal (pNC) retinal nerve fiber layer thickness (RNFLT) and pNC choroidal thickness (CT) were calculated within 30° sectors relative to the Foveal-BMO (FoBMO) axis. Hi-ESF eyes were defined to be those with an ESF region ≥100 µms in at least 1 sector. Results: Hi-Myo eyes more frequently demonstrated Hi-ESF regions (87/122) than Non-Hi-myo-Healthy eyes (73/362) and contained significantly larger ENC, EOCBT, and ESF regions (P < .001) which were greatest in magnitude and prevalence within the inferior-temporal FoBMO sectors where Hi-Myo pNC-RNFLT and pNC[sbnd]CT were thinnest. BMO/ASCO offset and the BMO/SFO offset were both significantly increased (P < .001) in the Hi-Myo eyes, with the latter demonstrating a greater increase. Conclusions: ENC region tissue remodeling that includes the scleral flange is enhanced in Hi-Myo compared to Non-Hi-Myo-Healthy eyes. Longitudinal studies are necessary to determine whether the presence of an ENC region influences ONH susceptibility to aging and/or glaucoma.