title: Influence of macular pigment optical density spatial distribution on intraocular scatter.
abstract: OBJECTIVE
  This study evaluated the summed measures of macular pigment optical density (MPOD) spatial distribution and their effects on intraocular scatter using a commercially available device (C-Quant, Oculus, USA).
  
  
  METHODS
  A customized heterochromatic flicker photometer (cHFP) device was used to measure MPOD spatial distribution across the central 16° using a 1° stimulus. MPOD was calculated as a discrete measure and summed measures across the central 1°, 3.3°, 10° and 16° diameters. Intraocular scatter was determined as a mean of 5 trials in which reliability and repeatability measures were met using the C-Quant. MPOD spatial distribution maps were constructed and the effects of both discrete and summed values on intraocular scatter were examined.
  
  
  RESULTS
  Spatial mapping identified mean values for discrete MPOD [0.32 (s.d.=0.08)], MPOD summed across central 1° [0.37 (s.d.=0.11)], MPOD summed across central 3.3° [0.85 (s.d.=0.20)], MPOD summed across central 10° [1.60 (s.d.=0.35)] and MPOD summed across central 16° [1.78 (s.d.=0.39)]. Mean intraocular scatter was 0.83 (s.d.=0.16) log units. While there were consistent trends for an inverse relationship between MPOD and scatter, these relationships were not statistically significant. Correlations between the highest and lowest quartiles of MPOD within the central 1° were near significance.
  
  
  CONCLUSIONS
  While there was an overall trend of decreased intraocular forward scatter with increased MPOD consistent with selective short wavelength visible light attenuation, neither discrete nor summed values of MPOD significantly influence intraocular scatter as measured by the C-Quant device.
authors.affiliation: University of Missouri-St Louis, College of Optometry, United States. Electronic address: cmpyv6@umsl.edu.
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Putnam
authors.affiliation: University of Missouri-St Louis, College of Optometry, United States.
authors.forename: Pauline J
authors.initials: PJ
authors.lastname: Bland
authors.affiliation: University of Missouri-St Louis, College of Optometry, United States.
authors.forename: Carl J
authors.initials: CJ
authors.lastname: Bassi
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008266:Macula Lutea / Q000378:metabolism*; D065348:Macular Pigment / Q000378:metabolism*; D008297:Male; D061848:Optical Imaging / Q000379:methods; D010783:Photometry / Q000379:methods; D015203:Reproducibility of Results; D012160:Retina / Q000502:physiology*; D012542:Scattering, Radiation; D041623:Tomography, Optical Coherence; D055815:Young Adult
chemical_list: D065348:Macular Pigment
keywords: Densidad óptica del pigmento macular; Dispersión intraocular; Distribución espacial; Intraocular scatter; Macular pigment optical density; Spatial distribution