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A 12-week lutein supplementation improves visual function in Chinese people with long-term computer display light exposure – Source: British Journal of Nutrition, feb 19, 2009

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By Le Ma, Xiao-Ming Lin, et al. • www.ProHealth.com • March 13, 2009


We aimed to examine the effect of different doses of lutein supplementation on visual function in subjects with long-term computer display light exposure.

Thirty-seven healthy subjects with long-term computer display light exposure ranging in age from 22 to 30 years were randomly assigned to one of three groups: Group L6 (6 mg lutein/day, n 12); Group L12 (12 mg lutein/day, n 13); and Group Placebo (maltodextrin placebo, n 12).

Levels of serum lutein and visual performance indices such as visual acuity, contrast sensitivity and glare sensitivity were measured at weeks 0 and 12. [Contrast sensitivity is ability to distinguish an object from its background. Glare sensitivity is ability to see objects in the presence of bright light.]

After 12-week lutein supplementation, serum lutein concentrations of Groups L6 and L12 increased from 0•356 (SD 0•117) to 0•607 (SD 0•176) ?mol/l, and from 0•328 (SD 0•120) to 0•733 (SD 0•354) ?mol/l, respectively. No statistical changes from baseline were observed in uncorrected visual acuity and best-spectacle corrected visual acuity, whereas:

• There was a trend toward increase in visual acuity in Group L12.

• Contrast sensitivity in Groups L6 and L12 increased with supplementation, and statistical significance was reached at most visual angles of Group L12.

• No significant change was observed in glare sensitivity over time.

Visual function in healthy subjects who received the lutein supplement improved, especially in contrast sensitivity, suggesting that a higher intake of lutein may have beneficial effects on the visual performance.

Source: British Journal of Nutrition, Feb 19, 2009. Ma L, Lin XM, Zou ZY, Xu XR, Li Y, Xu R. Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing, P. R. China. [E-mail: Dr Xiao-Ming Lin linbjmu@bjmu.edu.cn]





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