Study on the effect of caffeine intake on tear production and its correlation with genetic variation

Study on the effect of caffeine intake on tear production and its correlation with genetic variation - Study on the effect of caffeine intake on tear production

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000002903

Enrollment

Registered

2009-12-24

Start date

2007-08-01

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

Dry eye

Interventions

Caffeine (Washout) Placebo Placebo (Washout) Caffeine

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Normal adults

Exclusion criteria

Exclusion criteria: Patients with dry eye of moderate degree or more. Schirmer test value of 5 mm or less. Tear breakup time of 5 seconds or less.

Design outcomes

Primary

Measure	Time frame
Tear meniscus height	—

Countries

Japan

Contacts

Public ContactShiro Amano

University of Tokyo Hospital Department of Corneal Transplantation

amanos-tky@umin.ac.jp03-5800-5109

Outcome results

None listed

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