title: The impact of cataract on the quantitative, non-invasive assessment of retinal blood Flow.
abstract: OBJECTIVE
  The aim of the study was to determine the impact of cataract on the quantitative, non-invasive assessment of retinal blood flow assessed by bidirectional laser Doppler flowmetry and simultaneous vessel densitometry.
  
  
  METHODS
  Ten patients scheduled for extracapsular cataract extraction using phacoemulsification and intraocular lens implantation between the ages of 61 and 84 (mean age 73 years, SD ± 8) were prospectively recruited. Two visits were required to complete the study; one visit prior to extracapsular cataract extraction and one at least 6 weeks after the surgery to allow for sufficient postoperative recovery. The severity of cataract was documented using the Lens Opacity Classification System (LOCS, III) at the first visit. Retinal arteriolar hemodynamics were measured at both visits using the high-intensity setting of the Canon Laser Blood Flowmeter.
  
  
  RESULTS
  All eyes showed no clinical signs of postoperative intraocular inflammation. The quantitative assessment of retinal arteriolar diameter and blood flow were reduced following extracapsular cataract extraction (Wilcoxon signed-rank test, p = 0.022 and p=0.028, respectively); however, centreline blood velocity was not significantly changed (Wilcoxon signed-rank test, p=0.074). Intraocular pressure was unchanged pre- and postcataract extraction.
  
  
  CONCLUSIONS
  Retinal vessel densitometry assessment in the presence of cataract results in the erroneous elevation of the diameter measurement and thereby the calculation of blood flow. The bidirectional Doppler assessment of blood velocity appears to be more robust to light scatter induced by cataract. Care needs to be exercised in the interpretation of studies of retinal vessel diameter or blood flow that utilize similar densitometry techniques.
authors.affiliation: Retina Research Group, Department of Ophthalmology and Vision Science, University of Toronto, Toronto, ON, Canada.
authors.forename: Behrooz
authors.initials: B
authors.lastname: Azizi
authors.forename: Tien
authors.initials: T
authors.lastname: Wong
authors.forename: Jennifer
authors.initials: J
authors.lastname: Wan
authors.forename: Shaun
authors.initials: S
authors.lastname: Singer
authors.forename: Chris
authors.initials: C
authors.lastname: Hudson
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001160:Arterioles / Q000502:physiology; D001783:Blood Flow Velocity; D002386:Cataract / Q000145:classification / Q000503:physiopathology*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology; D017078:Laser-Doppler Flowmetry; D019654:Lens Implantation, Intraocular; D008875:Middle Aged; D018918:Phacoemulsification; D011446:Prospective Studies; D012039:Regional Blood Flow / Q000502:physiology; D012161:Retinal Artery / Q000502:physiology*