title: Prevalence and associations of incomplete posterior vitreous detachment in adult Chinese: the Beijing Eye Study.
abstract: OBJECTIVE
  To determine prevalence and associations of incomplete posterior vitreous detachment (PVD).
  
  
  METHODS
  The population-based cross-sectional Beijing Eye Study 2011 included 3468 individuals with a mean age of 64.6±9.8 years (range: 50-93 years). A detailed ophthalmic examination was performed including spectral-domain optical coherence tomography (SD-OCT). Incomplete PVD was differentiated into type 1 (shallow PVD with circular perifoveal vitreous attachment), type 2 (PVD reaching fovea but not foveola), type 3 (shallow PVD with pinpoint vitreous attachment at the foveola), and type 4 (PVD completely detached from the macula, attached to the optic disc).
  
  
  RESULTS
  An incomplete PVD was detected in 3948 eyes (prevalence: 60.5±0.6%; 95% Confidence Interval (CI): 59.3%,61.7%) of 2198 subjects (67.1±0.8%;95%CI: 65.6%,68.7%). Type 1 PVD was seen in 3090 (78.3%) eyes, type 2 PVD in 504 (12.8%) eyes, type 3 PVD in 70 (1.8%) eyes, and type 4 PVD in 284 (7.2%) eyes. Prevalence of incomplete PVD was associated with younger age (P<0.001;OR:0.91), male gender (P<0.001;OR:0.64), rural region of habitation (P<0.001;OR:0.49), larger corneal diameter (P = 0.04;OR:0.91), better best corrected visual acuity (P = 0.02;OR:0.41), and hyperopic refractive error (P<0.001;OR:1.15). The type of incomplete PVD was associated with higher age (P<0.001), urban region of habitation (P<0.001), myopic refractive error (P = 0.001), thinner cornea (P = 0.005), and better best corrected visual acuity (P = 0.056).
  
  
  CONCLUSIONS
  In adult Chinese in Greater Beijing, prevalence of an incomplete PVD (detected in 67.1% subjects) was associated with younger age, male gender, rural region of habitation, larger corneal diameter, better best corrected visual acuity and hyperopic refractive error.
authors.affiliation: Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Shao
authors.forename: Liang
authors.initials: L
authors.lastname: Xu
authors.forename: Qi Sheng
authors.initials: QS
authors.lastname: You
authors.forename: Ya Xing
authors.initials: YX
authors.lastname: Wang
authors.forename: Chang Xi
authors.initials: CX
authors.lastname: Chen
authors.forename: Hua
authors.initials: H
authors.lastname: Yang
authors.forename: Jin Qiong
authors.initials: JQ
authors.lastname: Zhou
authors.forename: Jost B
authors.initials: JB
authors.lastname: Jonas
authors.forename: Wen Bin
authors.initials: WB
authors.lastname: Wei
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People / Q000706:statistics & numerical data*; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D015995:Prevalence; D012307:Risk Factors; D020255:Vitreous Detachment / Q000453:epidemiology*
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