title: In vivo assessment of retinal carotenoids: macular pigment detection techniques and their impact on monitoring pigment status.
abstract: Of the many carotenoids found within human tissue, only the carotenoids within the human retina can be assessed noninvasively at present. Such assessment should eventually provide a more complete understanding of the functional role of retinal lutein (L) and zeaxanthin (Z) (termed macular pigment, MP) in human vision. The emerging data allow for some initial observations. For example, there appears to be wide variation (>factor of 10) in the concentration of MP. Although MP levels have been recorded from nondetectable to 1.20 OD (optical density), the "average" levels, relative to what is possible, appear low. This may be due in part to the low average dietary intake of L and Z in the typical U.S. diet. Nonetheless, individual differences in MP may also be influenced by nondietary factors such as genetics, demographics and lifestyle characteristics. Some evidence indicates that the MP carotenoids may protect the retina and lens, and could improve vision through some optical mechanisms. Consequently, efforts to determine typical MP levels and the factors that influence individual differences in MP density should be continued.
authors.affiliation: Department of Animal and Nutritional Sciences, University of New Hampshire, Durham, NH, USA. joanne.celantano@unh.edu
authors.forename: Joanne
authors.initials: J
authors.lastname: Curran Celentano
authors.forename: Joanne D
authors.initials: JD
authors.lastname: Burke
authors.forename: Billy R
authors.initials: BR
authors.lastname: Hammond
mesh_terms: D002338:Carotenoids / Q000032:analysis*; D004032:Diet; D005260:Female; D006801:Humans; D014975:Lutein / Q000008:administration & dosage / Q000032:analysis; D008266:Macula Lutea / Q000737:chemistry*; D008297:Male; D010783:Photometry / Q000379:methods; D010860:Pigments, Biological / Q000032:analysis*; D012016:Reference Values; D012160:Retina / Q000737:chemistry*; D024341:Xanthophylls; D065146:Zeaxanthins; D019207:beta Carotene / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000032:analysis
chemical_list: D010860:Pigments, Biological; D024341:Xanthophylls; D065146:Zeaxanthins; D019207:beta Carotene; D002338:Carotenoids; D014975:Lutein