Light source for myopia prevention article and method of using light source for myopia prevention article

A method of using a light source for a myopia prevention article,

• the light source comprising:
• a light emitter configured to emit a light, the light giving an emission spectrum continuously extending from a first wavelength of not less than 360 nm and not more than 400 nm to a second wavelength of more than 400 nm, and the light having a color temperature of not less than 2600 K and not more than 7000 K,
• the method comprising:
• irradiating a target with the light such that an irradiance in a wavelength region of 300 nm to 400 nm on the target is set at not less than 10 μW/cm2 and not more than 400 μW/cm2,
• the irradiance being set by regulating at least one selected from the group consisting of:
• an interval between the light emitter and the target;
• and
• a power supply voltage to be supplied to the light emitter.