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Lutein supplementation improves visual performance in Chinese drivers: 1-year randomized, double-blind,
Yuan Yao1, Qing-hua Qiu, Xing-Wei Wu
1Shanghai First People's Hospital, School of Medicine, Shanghai Jiao-tong University, Shanghai, PR China.
Nutrition (Burbank, Los Angeles County, Calif.)
|January 31, 2013
Summary
Daily lutein supplementation improved macular pigment optical density (MPOD) and visual function in drivers. This carotenoid may enhance night driving and low-light visual tasks.
Area of Science:
- Ophthalmology
- Nutritional Science
- Human Physiology
Background:
- Lutein, a carotenoid, is known to influence visual performance.
- Its specific effects on occupational groups, such as drivers, require further investigation.
- Long-term light exposure may impact visual function in drivers.
Purpose of the Study:
- To investigate the impact of lutein supplementation on visual function in healthy drivers.
- To assess the effects of lutein on individuals with sustained light exposure.
Main Methods:
- A 1-year, randomized, double-blind, placebo-controlled trial.
- 120 healthy drivers received 20 mg of lutein daily or a placebo.
- Evaluations included visual acuity, serum lutein, macular pigment optical density (MPOD), contrast and glare sensitivity, and visual functioning questionnaires.
Main Results:
- Significant increases in serum lutein and central MPOD were observed in the lutein group.
- Contrast and glare sensitivity showed significant improvements, particularly in mesopic conditions.
- The lutein group reported significant improvements in the driving subscale of the Visual Functioning Questionnaire.
Conclusions:
- Daily 20 mg lutein supplementation effectively increases MPOD levels.
- Lutein supplementation shows potential benefits for night driving and spatial discrimination tasks in low light.
