Effects of supplementation of blueberry, lutein and propolis on eye fatigue

INTERVENTION: Effectiveness of 2‐week intake of test food compared with placebo control Effectiveness of 2‐week intake of test food compared with baseline CONDITION: Eye fatigue PRIMARY OUTCOME: Working performance, eye fatigue sensation in visual analogue scale(VAS) and the Jikaku‐sho shirabe under VDT operation SECONDARY OUTCOME: Tear volume measurement(Schirmer's test), autonomic nervous system function(spectrum analysis a‐a interval of accelerated plethysmography) under VDT operation INCLUSION CRITERIA: 1)Healthy males and females aged from 30 to 59 years (bounds included) 2)Subject who has eye fatigue feeling under VDT operation 3)Subject having a briefing of the content of the present study, fully understanding and agreeing to its objective and being able to personally sign a written informed consent