Association between radiation, glaucoma subtype, and retinal vessel diameter in atomic bomb survivors

• Published in: Scientific reports Vol. 9; no. 1; pp. 8642 - 10
• Main Authors: Kiuchi, Yoshiaki, Yanagi, Masahide, Itakura, Katsumasa, Takahashi, Ikuno, Hida, Ayumi, Ohishi, Waka, Furukawa, Kyoji
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 14.06.2019; Nature Publishing Group
• Subjects: 60 APPLIED LIFE SCIENCES; 692/308/174; 692/699/3161/3172; Aged; Atomic Bomb Survivors; Atomic bombs; Blood flow; Female; Glaucoma; Glaucoma - classification; Glaucoma - pathology; Health risk assessment; Humanities and Social Sciences; Humans; Logistic Models; Male; multidisciplinary; Nuclear weapons; Probability; Retina; Retinal Vessels - pathology; Retinal Vessels - radiation effects; Science; Science & Technology - Other Topics; Science (multidisciplinary)
• DOI: 10.1038/s41598-019-45049-7
• ISSN: 2045-2322

We examined the relationship between glaucoma subtype and retinal vascular caliber as markers of ocular circulation. Subjects were Japanese atomic bomb survivors in Hiroshima and Nagasaki. After a screening examination, potential cases were subjected to further definitive examination. The diameters of central retinal artery and vein equivalents (CRAE and CRVE) on digitized retinal photographs were measured using an established method. Generalized linear regression analyses were used to examine the associations among vessel diameters, radiation exposure, and prevalence of glaucoma subtypes among the study subjects. We identified 196 cases of glaucoma (12%) based on optic disc appearance, perimetry results, and other ocular findings. The main subtypes were primary angle-closure glaucoma, primary open-angle glaucoma and normal-tension glaucoma (NTG). NTG was the dominant subtype (78%). NTG was negatively associated with CRAE and CRVE, and positively associated with radiation dose. CRVE was negatively associated with radiation dose and the association was unclear for CRAE. The smaller retinal vessel caliber in NTG patients than in subjects without glaucoma may indicate an association between ocular blood flow and the pathogenesis of NTG. However, significant relationships among vessel calibers, NTG and radiation exposure were not clear.