Effect of Colour Temperature of Reading Lamp on Refractive Error Development

Not Applicable

Recruiting

• Conditions: Refractive Errors
• Interventions: Device: 4500K Reading lamp; Device: 6500K Reading lamp; Device: 3000K Reading lamp

• Registration Number: NCT05733182
• Lead Sponsor: The Hong Kong Polytechnic University

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.

Study Timeline

• Study Start: 2022-07-01
• Study First Submitted: 2023-02-06
• Study First Submitted QC: 2023-02-14
• Study First Posted: 2023-02-17
• Status Verified: 2024-02
• Last Update Submitted: 2024-02-28
• Last Update Posted: 2024-03-01
• Primary Completion: 2025-06-30
• Study Completion: 2027-06-30

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 798

Inclusion Criteria

• aged between 4 and 18 years

Exclusion Criteria

• have received myopia control intervention

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
4500K	4500K Reading lamp	Participants will receive a reading lamp of colour temperature 4500K.
6500K	6500K Reading lamp	Participants will receive a reading lamp of colour temperature 6500K.
3000K	3000K Reading lamp	Participants will receive a reading lamp of colour temperature 3000K.

Primary Outcome Measures

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

Secondary Outcome Measures

Name	Time	Method
Colour vision	up to 12 months	Ability to distinguish colours (pass/fail \& severity of defect) measured by pseudoisochromatic plates

Trial Locations

Locations (1)

Optometry Research Clinic; 🇭🇰 Hong Kong, Kowloon, Hong Kong