Effect of Colour Temperature of Reading Lamp on Refractive Error Development

Status

Recruiting

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT05733182

Enrollment

798

Registered

2023-02-17

Start date

2022-07-01

Completion date

2027-06-30

Last updated

2024-03-01

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

Conditions

Refractive Errors

Keywords

Myopia, Environment, Colour temperature, Lighting

Brief summary

This is a 12-month longitudinal randomized controlled trial aiming to evaluate the effect of colour temperature of reading lamp on refractive error development.

Detailed description

Myopia has reached epidemic in the world, especially in East Asia. The proportion of myopic population increases drastically during schoolage. Lack of light exposure has been suggested to be a risk for myopia development, in which additional reading lamp may alleviate this condition. However, the effect of colour temperature of the reading lamp is unknown on childhood refractive error development. In this study, investigators will randomly allocate school-aged children into groups, who will receive reading lamps of different colour temperatures for their daily use. The participants' refractive error and axial length will be evaluated.

Interventions

DEVICE3000K Reading lamp

Reading lamp with custom-made circuitry to emit light of 3000K colour temperature

DEVICE4500K Reading lamp

Reading lamp with custom-made circuitry to emit light of 4500K colour temperature

DEVICE6500K Reading lamp

Reading lamp with custom-made circuitry to emit light of 6500K colour temperature

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

SUPPORTIVE_CARE

Masking

DOUBLE (Subject, Investigator)

Intervention model description

Randomized clinical trial

Eligibility

Sex/Gender

ALL

Age

4 Years to 18 Years

Healthy volunteers

Yes

Inclusion criteria

* aged between 4 and 18 years

Exclusion criteria

* have received myopia control intervention

Design outcomes

Primary

Measure	Time frame	Description
Cycloplegic refraction	up to 12 months	Refractive error in diopter by autorefractor
Axial length	up to 12 months	Length of the eyeball in millimeter by partial coherence interferometer

Secondary

Measure	Time frame	Description
Colour vision	up to 12 months	Ability to distinguish colours (pass/fail & severity of defect) measured by pseudoisochromatic plates

Countries

Hong Kong

Contacts

Primary ContactKai Yip Choi, PhD

kaiyip.choi@polyu.edu.hk(852)34002934

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026