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Macular pigments: their characteristics and putative role
Nigel P Davies1, Antony B Morland
1Department of Ophthalmology, Chelsea and Westminster Hospital, Fulham Road, London SW10 9NH, UK.
Progress in Retinal and Eye Research
|August 11, 2004
Summary
Macular pigments (lutein and zeaxanthin) may offer antioxidant protection for the macula, but current evidence does not confirm improved visual function with higher pigment levels.
Area of Science:
- Ophthalmology
- Nutritional Science
- Carotenoid Research
Background:
- Macular pigments (MP), lutein and zeaxanthin, are carotenoids absorbing blue-green light.
- MP concentration varies significantly in the human population.
- Proposed roles include visual function enhancement and antioxidant protection.
Purpose of the Study:
- To review the origin, spectral characteristics, and ocular distribution of MP.
- To discuss MP's effect on central visual function and measurement techniques.
- To evaluate the evidence for MP's proposed physiological roles.
Main Methods:
- Literature review of studies on macular pigments.
- Analysis of spectral characteristics and ocular distribution.
- Examination of in vivo MP optical density measurement techniques.
Main Results:
- No firm evidence links higher MP levels to enhanced visual performance.
- Associative evidence suggests a link between low MP levels and macular diseases like AMD.
- Increased dietary MP intake raises serum and retinal MP levels.
Conclusions:
- While MP may theoretically improve vision, current data is inconclusive.
- Low MP levels are associated with macular disease, but direct protective effects are not proven.
- Longitudinal studies are needed to fully evaluate the protective potential of MP in macular health.