Color and Pupil Function

Effect of Light Spectrum on Pupil Function

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT02636140

Enrollment

Registered

2015-12-21

Start date

2016-02-29

Completion date

2016-08-31

Last updated

2016-11-02

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

Conditions

Pupil

Brief summary

This study will examine the effects of different colors of light on pupil function and alertness.

Interventions

OTHERLight

A brief, 1 minute exposure to light of varying color and intensity. The combination of color and intensity will be the same in all participants, but the order in which they are received is randomized.

Study design

Allocation

Intervention model

SINGLE_GROUP

Primary purpose

BASIC_SCIENCE

Masking

DOUBLE (Subject, Outcomes Assessor)

Eligibility

Sex/Gender

ALL

Age

18 Years to 35 Years

Healthy volunteers

Yes

Inclusion criteria

* Aged 18-35 * Good health

Exclusion criteria

* Sleep disorder * Extreme chronotype * Smoker * Abnormal color vision * Ocular pathology (other than mild or moderate refractive error) * Visual field defects * Alcohol abuse * Use of illegal drugs

Design outcomes

Primary

Measure	Time frame	Description
Change in pupil size	Baseline and 10 minutes	Change in pupil size from baseline during and following brief light exposure

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 24, 2026