Effects of light exposure that has less stimulation on intrinsically photosensitive retinal ganglion cells(ipRGCs) and keeps color rendering property during night on human circadian rhythms

Effects of light exposure that has less stimulation on intrinsically photosensitive retinal ganglion cells(ipRGCs) and keeps color rendering property during night on human circadian rhythms - Effects of light exposure that has less stimulation on intrinsically photosensitive retinal ganglion cells(ipRGCs) and keeps color rendering property during night on human circadian rhythms

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000056174

Enrollment

Registered

2025-01-01

Start date

2024-12-31

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 adults

Interventions

Light that has less stimulation on ipRGCs General LED light

Eligibility

Sex/Gender

Male

Inclusion criteria

Inclusion criteria: Since the purpose is to collect the basic data, the study will be conducted with adults, not the elderly.

Exclusion criteria

Exclusion criteria: (1) Patients with a result score of 3 or 4 on the Cornell Medical Index for neurosis emotional disorders (2) The score of Morningness Eveningness Questionnaire is 70 or more(extreme morning person) or 30 or less(extreme night person) (3) Pittsburgh Sleep Questionnaire with a score of 6 or higher (4) Those who have had a change in their living hours due to shift work or travel to time zones within one month (5) Those who are taking any oral medication or smoking (6) Those who has color vision variation (7) Dark-adapted pupil size is out of range of 5.72 plus or minus 1.19 mm(mean plus or minus 3SD) (8) Students who are currently enrolled or may be enrolled in a course that the principal investigator is taking

Design outcomes

Primary

Measure	Time frame
Sleep efficiency	—

Countries

Japan

Contacts

Public ContactTomoko Wakamura

Kyoto University School of Human Health Sciences, Graduate School of Medicine

wakamura.tomoko.5v@kyoto-u.ac.jp81-75-751-3974

Outcome results

None listed

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