title: Macular pigment optical density spatial distribution measured in a subject with oculocutaneous albinism.
abstract: OBJECTIVE
  Previous studies of macular pigment optical density (MPOD) distribution in individuals with oculocutaneous albinism (OCA) have primarily used objective measurement techniques including fundus reflectometry and autofluorescence. We report here on a subject with OCA and their corresponding MPOD distribution assessed through heterochromatic flicker photometry (HFP).
  
  
  METHODS
  A subject with a history of OCA presented with an ocular history including strabismus surgery of the LE with persistent amblyopia and mild, latent nystagmus. Best corrected visual acuity was 20/25- RE and 20/40- LE. Spectral domain optical coherence tomography (SD-OCT) and fundus photography were also obtained. Evaluation of MPOD spatial distribution up to 8 degrees eccentricity from the fovea was performed using HFP.
  
  
  RESULTS
  SD-OCT indicated a persistence of multiple inner retinal layers within the foveal region in the RE and LE including symmetric foveal thickening consistent with foveal hypoplasia. Fundus photography showed mild retinal pigmented epithelial (RPE) hypopigmentation and a poorly demarcated macula. OriginPro 9 was used to plot MPOD spatial distribution of the subject and a 33-subject sample. The OCA subject demonstrated a foveal MPOD of 0.10 with undetectable levels at 6 degrees eccentricity. The study sample showed a mean foveal MPOD of 0.34 and mean 6 degree eccentricity values of 0.03.
  
  
  CONCLUSIONS
  Consistent with previous macular pigment (MP) studies of OCA, overall MPOD is reduced in our subject. Mild phenotypic expression of OCA with high functional visual acuity may represent a Henle fiber layer amenable to additional MP deposition. Further study of MP supplementation in OCA patients is warranted.
authors.affiliation: University of Missouri-St Louis College of Optometry, St. Louis, MO, 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, St. Louis, MO, United States.
authors.forename: Pauline J
authors.initials: PJ
authors.lastname: Bland
mesh_terms: D016117:Albinism, Ocular; D006801:Humans; D007223:Infant; D065348:Macular Pigment; D012160:Retina; D041623:Tomography, Optical Coherence / Q000379:methods
chemical_list: D065348:Macular Pigment
keywords: Macular pigment optical density; Oculocutaneous albinism; Spatial distribution; albinismo oculocutáneo; densidad óptica del pigmento macular; distribución espacial