Kido A, Tamura H, Ikeda HO, et al. - Using nationwide health insurance claims data, researchers sought to examine the nationwide epidemiological and clinical features of central retinal artery occlusion (CRAO) in Japan. A total of 16,069,762 claims data were analyzed in the sampling dataset of the National Database of Health Insurance Claims and Specific Health Checkups of Japan (NDB), which is the nationwide health insurance claims database of 127 million whole Japanese individuals. Data reported that the crude incidence rate of CRAO in Japan was 5.84 per 100,000 person-years. In Japan, as reported previously, the crude incidence rate of CRAO was higher than in other countries, reflecting the structure of the Japanese population as a super-aged society. Such findings can be useful in developing appropriate health policies to address the growing incidence of CRAO among the ageing population.