Rhegmatogenous retinal detachment (RRD) is a blinding disease characterized by the separation of the inner neurosensory retina from the outer retinal pigment epithelium due to a break in the retina. Fluid accumulates in the subretinal space through the break in the retina, and the decreasing function of the neurosensory retina leads to vision loss.
Previous studies have reported that the annual incidence of RRD was 7.98-18.2 per 100,000 people. Because the incidence of RRD is influenced by demographic characteristics, severe myopia, and history of cataract surgery, the incidence varies widely by region and age group. In Japan, a previous retrospective study reported that the incidence of RRD in Kumamoto Prefecture was 10.4 per 100,000 people (9.6 in males, 11.2 in females). However, this study was conducted in 1990, and the demographic characteristics in Kumamoto have changed during the last 20 years. To date, some studies have reported the incidence of RRD over a 20-year period; however, no studies have compared the 20-year data with the data from the same region 20 years previously in an Asian population.
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