Objective: The study aimed to verify that ingestion of multiple dietary supplement containing lutein, astaxanthin,
cyanidin-3-glucoside and docosahexaenoic acid (DHA) would improve accommodative ability of aged
and older subjects who were aware of eye strain on a daily basis.
Methods: A randomized double-blind placebo-controlled parallel group comparison study was conducted for
48 participants aged 45 to 64 years who complained of eye strain. The subjects took multiple dietary supplement
containing 10 mg of lutein, 20 mg of bilberry extract and 26.5 mg of black soybean hull extract (a total
of 2.3 mg of cyanidin-3-glucoside in both extracts), 4 mg of astaxanthin, and 50 mg of DHA (test supplement)
or placebo for four consecutive weeks. Near-point accommodation (NPA) and subjective symptoms
were evaluated both before and after four weeks’ intake.
Results: The variation of the NPA of both eyes from baseline to 4 weeks’ post-intake in the test supplement
group was significantly higher than in the placebo group (1.321±0.394 diopter (D) in the test supplement
group and 0.108±0.336 D in the placebo group, p=0.023). The multiple dietary supplement group showed improvement
in the NPA. Regarding subjective symptoms, significant improvement of “stiff shoulders or neck”
and “blurred vision” was also found in the test supplement group compared to the placebo group (p<0.05).
There were no safety concerns in this study.
Conclusion: This study shows that multiple dietary supplement containing lutein, astaxanthin, cyanidin-3-
glucoside, and DHA has effect to improve accommodative ability and subjective symptoms related to eye fatigue.