title: Seasonal variation of retinal detachment in Lebanon.
abstract: BACKGROUND
  The literature remains controversial regarding seasonal variation of rhegmatogenous retinal detachment (RRD).
  
  
  METHODS
  In this retrospective chart review, seasonal variation of RRD was examined based on the records of 211 consecutive patients operated for idiopathic RRD in one referral medical center over a 13-year period.
  
  
  RESULTS
  The number of eyes with RRD recorded per season was 46 in autumn, 46 in winter, 62 in spring and 57 in summer. There was a significant seasonal variation (p < 0.05) with an increase in RRD in the warm seasons (spring and summer) compared to the cold seasons (winter and autumn; 56 vs. 44%). Right eyes were more likely to be affected than left eyes (54 vs. 46%), and cases presented with a significantly younger age at onset in the warm than in the cold seasons (47 vs. 54 years, p = 0.007). A literature review of 8,533 cases including the present case series established further the seasonal variation of RRD (p < 0.001).
  
  
  CONCLUSIONS
  There is convincing evidence for a seasonal variation of RRD in Lebanon and in the literature. This is likely to be related to sun exposure and outdoor activities in the warm seasons.
authors.affiliation: Department of Ophthalmology, American University of Beirut, Beirut, Lebanon. dr.ahmad@cyberia.net.lb
authors.forename: Ahmad M
authors.initials: AM
authors.lastname: Mansour
authors.forename: Rola N
authors.initials: RN
authors.lastname: Hamam
authors.forename: Tarek A
authors.initials: TA
authors.lastname: Sibai
authors.forename: Toufic I
authors.initials: TI
authors.lastname: Farah
authors.forename: Abla
authors.initials: A
authors.lastname: Mehio-Sibai
authors.forename: Mona
authors.initials: M
authors.lastname: Kanaan