title: Age-dependent vitreous separation from the macula in a clinic population.
abstract: BACKGROUND
  Vitreous degeneration begins soon after birth and accelerates throughout life. Vitreous liquefaction with a slowly progressive separation of the posterior hyaloid from the peripheral macula usually leads to complete posterior vitreous detachment. The purpose of this study is to measure the age-related prevalence of partial vitreous separation and the length of residual vitreous adhesion in an ophthalmology clinic population.
  
  
  METHODS
  Patients examined by the senior author (MWS) during a 6-month period were included in a retrospective chart review. Demographic data and spectral domain optical coherence tomography scan results were gathered. Data analysis with descriptive statistics focused on the prevalence and extent of partial vitreous separation.
  
  
  RESULTS
  The mean age of the study patients was 69.9 years, and 62% were phakic. The highest prevalence of partial posterior hyaloid separation from the internal limiting membrane (71.2%) was seen in the 50- to 54-year age group. This prevalence rate steadily decreased to 5.6% in the 95- to 99-year age group. The prevalence of complete vitreous detachment as determined by slit-lamp biomicroscopy increased from 1.7% in the <50-year age group to a maximum of 29.2% in the 75- to 79-year group. The length of vitreomacular adhesion averaged 4.6 mm in the 50- to 54-year age group and steadily decreased to 2.1 mm in the 90- to 95-year group.
  
  
  CONCLUSIONS
  Vitreomacular separation affects the majority of eyes in the sixth decade of life. The prevalence of partial vitreous separation decreases with advancing age, probably because an increasing number of these patients progress to complete posterior vitreous detachment.
authors.affiliation: Georgetown University, Washington, DC.
authors.forename: Zahid
authors.initials: Z
authors.lastname: Syed
authors.affiliation: Department of Ophthalmology, Mayo School of Medicine, Jacksonville, FL, USA.
authors.forename: Michael W
authors.initials: MW
authors.lastname: Stewart
keywords: optical coherence tomography; posterior hyaloid; posterior vitreous detachment; syneresis; vitreomacular adhesion; vitreous degeneration