title: Prevalence of second-eye cataract surgery and time interval after first-eye surgery in Iran: a clinic-based study.
abstract: OBJECTIVE
  To determine the prevalence of second-eye senile cataract surgery (SECS) as a proportion of all senile cataract surgeries and the trend in the interval between first and second cataract operations in a main referral and academic eye hospital.
  
  
  METHODS
  In this cross-sectional study, a list of patients who underwent senile cataract surgery over four consecutive years (2006-2009) was retrieved from hospital computer-based records as the sampling frame. With a systematic random method, 15% of records were selected (1,585 out of 10,517 records).
  
  
  RESULTS
  First- and second-eye operations were performed in 1,139 (71.9%; 95% confidence interval [CI], 69.5-74.1) and 446 eyes (28.1%; 95% CI, 25.9-30.35), respectively. The proportion of SECS procedures increased from 24.3% in 2006 to 33.4% in 2009 (P = 0.017). The median (interquartile range) interval between the two operations was 9 (4-24) months, which remained stable during the study period. The SECS rate was 10.4% higher (P = 0.01) and the time interval was 13 months shorter (P = 0.007) in patients who underwent phacoemulsification than extracapsular cataract extraction.
  
  
  CONCLUSIONS
  The number of cataract operations in this tertiary eye care setting increased 1.5 fold over the study period. The proportion of second-eye operations also rose from 1/4 to 1/3 during the same time.
authors.affiliation: Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Marzieh
authors.initials: M
authors.lastname: Katibeh
authors.forename: Hamid-Reza
authors.initials: HR
authors.lastname: Moein
authors.forename: Mehdi
authors.initials: M
authors.lastname: Yaseri
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Sehat
authors.forename: Armen
authors.initials: A
authors.lastname: Eskandari
authors.forename: Hossein
authors.initials: H
authors.lastname: Ziaei
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002386:Cataract / Q000453:epidemiology*; D002387:Cataract Extraction / Q000706:statistics & numerical data*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D013997:Time Factors
keywords: Cataract Extraction; Trends; Utilization