title: Effect of aging on foveolar choroidal circulation.
abstract: OBJECTIVE
  To determine the effect of aging on choroidal blood flow (ChBFlow) in the foveolar region of the normal ocular fundus.
  
  
  METHODS
  Choroidal blood flow was determined using laser Doppler flowmetry. Twenty-nine eyes of 29 normal subjects whose ages ranged from 15 to 76 years (mean+/-SD, 42+/-18 years) were included in this study. Relative choroidal blood velocity (ChBVel), choroidal blood volume (ChBVol), and ChBFlow were determined in the foveolar region by asking the subjects to fixate on the probing laser beam.
  
  
  RESULTS
  Significant negative correlations were observed between ChBVol and the subject's age (R=-0.52, P=.004) and between ChBFlow and the subject's age (R=-0.54, P=.003). No significant correlation was detected between ChBVel and the subject's age (R=0.07, P=.70). Significant differences were observed in ChBVol and ChBFlow between the younger subjects aged 15 to 45 years (mean+/-SD, 0.48+/-0.20 arbitrary units [AU] and 18.9+/-5.8 AU, respectively) and the older ones aged 46 to 76 years (mean+/-SD, 0.34+/-0.11 AU and 13.3+/-3.3 AU, respectively; unpaired Student t test, P=.04 and P=.007, respectively).
  
  
  CONCLUSIONS
  In the subjects studied, foveolar ChBFlow decreases with age. This change is probably related to the decrease in density and diameter of the choriocapillaries that occurs with increasing age.
authors.affiliation: Department of Ophthalmology, School of Medicine, University of Pennsylvania, Philadelphia, USA.
authors.forename: J E
authors.initials: JE
authors.lastname: Grunwald
authors.forename: S M
authors.initials: SM
authors.lastname: Hariprasad
authors.forename: J
authors.initials: J
authors.lastname: DuPont
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D001775:Blood Circulation; D001783:Blood Flow Velocity; D002829:Choroid / Q000098:blood supply*; D005260:Female; D005584:Fovea Centralis / Q000098:blood supply*; D006801:Humans; D017078:Laser-Doppler Flowmetry; D008297:Male; D008875:Middle Aged