Demographics and Seasonality of Retinal Detachment, Retinal Breaks, and Posterior Vitreous Detachment from the Intelligent Research in Sight Registry.Purpose
 To investigate the incidence, seasonal variation, and differences among age, sex, and race for rhegmatogenous retinal detachment (RRD) repair, retinal break (RB) treatment, and posterior vitreous detachment (PVD) in the Intelligent Research in Sight (IRIS) Registry.


 Retrospective database study.


 Participants
 Patients in the IRIS Registry who underwent RRD repair, RB treatment, or cataract surgery (CS) based on Current Procedural Terminology codes and PVD diagnosis based on International Classification of Diseases, Ninth and Tenth Revision, codes.


 Daily incidence rates were defined as the ratio of patients who underwent RRD repair or RB treatment and patients with a diagnosis of PVD to the total number of patients followed on a given day within the IRIS Registry.  The CS group was included as a comparison for seasonal variation.  Rates were stratified by decade of life, sex, and race.


 Main Outcome Measures
 Time series trends for incidence rates of RRD, RB, and PVD.


 A total of 7 115 774 patients received a diagnosis of incident PVD, 237 646 patients underwent RRD repair, and 359 022 patients underwent RB treatment.  Also included were 5 940 448 patients who underwent CS.  The mean daily incidence for RRD repair, RB treatment, PVD diagnosis, and CS were 0.46 per 100 000 patients, 0.70 per 100 000 patients, 13.90 per 100 000 patients, and 11.80 per 100 000 patients, respectively.  Men showed higher incidence of RRD repair and RB treatment than women, whereas women showed higher incidence of PVD diagnosis.  Rhegmatogenous retinal detachment incidence was higher in White people compared with other races.  Seasonal decreases in PVD, RB treatment, RRD repair, and CS corresponded to national holidays, with larger decreases in winter months.  Kaplan-Meier estimates showed that RRD repair and RB treatment typically occurred within 60 days of PVD diagnosis.


 Conclusions
 Within the IRIS Registry, the highest incidence of RRD was in the 6th and 7th decade of life.  There was a higher incidence of RRD repair and RB treatment in men compared with women.  The seasonal variation associated with national holidays was less pronounced for RRD repair and RB treatment.
C
Patients in the IRIS Registry who underwent RRD repair, RB treatment, or cataract surgery (CS) based on Current Procedural Terminology codes and PVD diagnosis based on International Classification of Diseases, Ninth and Tenth Revision, codes.


 Daily incidence rates were defined as the ratio of patients who underwent RRD repair or RB treatment and patients with a diagnosis of PVD to the total number of patients followed on a given day within the IRIS Registry.  Within the IRIS Registry, the highest incidence of RRD was in the 6th and 7th decade of life. 
IRIS Registry