Bruch's membrane opening minimum rim width and retinal nerve fiber layer thickness in a Brazilian population of healthy subjects

• Published in: PloS one Vol. 13; no. 12; p. e0206887
• Main Authors: Zangalli, Camila S, Vianna, Jayme R, Reis, Alexandre S C, Miguel-Neto, Jamil, Burgoyne, Claude F, Chauhan, Balwantray C, Costa, Vital P
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 18-12-2018; Public Library of Science (PLoS)
• Subjects: Adolescent; Adult; African Americans; Age; Aged; Archives & records; Automation; Biology and Life Sciences; Brazil; Bruch Membrane - cytology; Bruch Membrane - diagnostic imaging; Choroid; Coherence (Optics); Descent; Female; Glaucoma; Health aspects; Healthy Volunteers; Humans; Male; Medicine and Health Sciences; Middle Aged; Neurofibrils; Ophthalmology; Optic Disk - anatomy & histology; Optic Disk - cytology; Optic Disk - diagnostic imaging; Optic nerve; Optical Coherence Tomography; People and places; Population; Race; Races; Research and Analysis Methods; Retina; Studies; Subgroups; Thickness; Tomography, Optical Coherence; Young Adult; Brazil; Canada; Barbados; United States > US; Baltimore Maryland
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0206887

To determine Bruch's membrane opening (BMO) minimum rim width (MRW) and peripapillary retinal nerve fiber layer thickness (RNFLT) measurements, acquired with optical coherence tomography (OCT) in healthy Brazilian individuals self-reported as African Descent (AD), European Descent (ED) and Mixed Descent (MD).
260 healthy individuals (78 AD, 103 ED and 79 MD) were included in this cross-sectional study conducted at the Clinics Hospital of the University of Campinas. We obtained optic nerve head (24 radial B scans) and peripapillary retinal nerve fiber layer (3.5-mm circle scan) images in one randomly selected eye of each subject.
After adjustment for BMO area and age, there were no significant differences in mean global MRW (P = 0.63) or RNFLT (P = 0.07) among the three groups. Regionally, there were no significant differences in either MRW or RNFLT in most sectors, except in the superonasal sector, in which both MRW and RNFLT were thinner among ED (P = 0.04, P<0.001, respectively). RNFLT was also thinner in ED in the inferonasal sector (P = 0.009). In all races, global MRW decreased and global RNFLT increased with BMO area. AD subjects had higher rates of global RNFLT decay with age (-0.32 μm/year) compared to ED and MD subjects (-0.10 μm/year and -0.08 μm/year, respectively; P = 0.01 and P = 0.02, respectively).
While we found no significant differences in global MRW and RNFLT among the three races, age-related thinning of the RNFLT was significantly higher in the AD subgroup, which warrants further study.