This is a 12-month longitudinal randomized controlled trial aiming to evaluate the effect of colour temperature of reading lamp on refractive error development.
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 Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
SUPPORTIVE_CARE
Masking
DOUBLE
Enrollment
798
Reading lamp with custom-made circuitry to emit light of 3000K colour temperature
Reading lamp with custom-made circuitry to emit light of 4500K colour temperature
Reading lamp with custom-made circuitry to emit light of 6500K colour temperature
Optometry Research Clinic
Hong Kong, Kowloon, Hong Kong
RECRUITINGCycloplegic refraction
Refractive error in diopter by autorefractor
Time frame: up to 12 months
Axial length
Length of the eyeball in millimeter by partial coherence interferometer
Time frame: up to 12 months
Colour vision
Ability to distinguish colours (pass/fail \& severity of defect) measured by pseudoisochromatic plates
Time frame: up to 12 months
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