Effect of Colour Temperature of Reading Lamp on Refractive Error Development

Study Overview
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Brief Summary
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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
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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.

Official Title
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Effect of Colour Temperature of Reading Lamp on Refractive Error Development

Conditions
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Refractive Errors

Intervention / Treatment
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* Device: 3000K Reading lamp
* Device: 4500K Reading lamp
* Device: 6500K Reading lamp


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: aged between 4 and 18 years Exclusion Criteria: have received myopia control intervention

Ages Eligible for Study
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Minimum Age: 4 Years
Maximum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Supportive Care
Allocation: Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: Randomized clinical trial
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: 3000K<br>Participants will receive a reading lamp of colour temperature 3000K. | Device: 3000K Reading lamp<br>* Reading lamp with custom-made circuitry to emit light of 3000K colour temperature<br>|
| Active Comparator: 4500K<br>Participants will receive a reading lamp of colour temperature 4500K. | Device: 4500K Reading lamp<br>* Reading lamp with custom-made circuitry to emit light of 4500K colour temperature<br>|
| Active Comparator: 6500K<br>Participants will receive a reading lamp of colour temperature 6500K. | Device: 6500K Reading lamp<br>* Reading lamp with custom-made circuitry to emit light of 6500K colour temperature<br>|

What is the study measuring?
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Primary Outcome Measures

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

Secondary Outcome Measures

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

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Myopia, Environment, Colour temperature, Lighting