A study involving human subjects on an influence of continuous intake of a test food product for four weeks on visual fatigue among healthy adults

A study involving human subjects on an influence of continuous intake of a test food product for four weeks on visual fatigue among healthy adults - A study involving human subjects on an influence of continuous intake of a test food product for four weeks on visual fatigue among healthy adults

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000029432

Enrollment

Registered

2019-03-31

Start date

2017-10-12

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Healthy adult

Interventions

4-week intake of the test food 4-week intake of the placebo food

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1) Age: 20 and over, below 50 2) Sex: Males and females with Japanese nationality 3) Subjective symptoms of visual fatigue 4) Daily use of home video game, a personal computer, and/or a smart phone, engaged in VDT work for at least 6 hours a day (*VDT work: work using a visual display terminal (VDT) with a display, a keyboard, etc., generally indicate work using a computer) 5) Those who can keep daily lifestyle during the study (no significant lifestyle change in the study period. Overseas travel and business travel are not permitted.) 6) Those who can continuously drink cocoa for four weeks 7) Those who can keep a journal everyday in the study period

Exclusion criteria

Exclusion criteria: 1) Currently in treatment for any disease, particularly for an immune disease (such as Sjogren's syndrome) or presence of another severe disease 2) Previous history of a malignant disease such as a malignant tumor, cardiac failure, or cardiac infarction, or currently in treatment for a chronic disease 3) Currently in treatment with medication (including eye drops) or current intake of Chinese herbal medicine 4) Presence or previous history of allergic reaction to medication or a food product 5) Contact lens user 6) Those who have undergone eye surgery such as LASIK 7) Presence of pollinosis 8) Regular intake of a food product (specific examples: blueberry, bilberry, cassis, red wine, etc.), supplement, or medication (including eye drops and vitamin supplements) that has an affect on the study and possibly has a positive effect on eyes 9) Drinking cocoa on a daily basis 10) Participation in any other clinical study involving human subjects within 3 months or current participation in any other clinical study involving human subjects 11) Working on night shift or with alternative work schedule 12) Currently in treatment for drug addiction or drug abuse or previous history of drug addiction or drug abuse 13) Nursing or pregnant, or a possibility of becoming pregnant during the study 14) Clinical findings of presbyopia 15) Eyelash extensions

Design outcomes

Primary

Measure	Time frame
1) Tonic accommodation test (HFC) 2) Accommodation capability test 3) Flicker test	—

Secondary

Measure	Time frame
VAS survey	—

Countries

Japan

Contacts

Public ContactOchitani Daisuke

HUMA R&D CORP Clinical Development Division

ochitani@huma-c.co.jp81-3-3431-1260

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026