Reason 1: Insufficient Lighting
Most houses in North America have dim indoor lighting, especially in bedrooms and studies. When elementary school children study in these spaces, they require additional light sources to ensure the healthy development of their eyes.

Reason 2: Mismatched Light Intensity
Individuals with darker irises, common among Asians, require a higher intensity of light. North American lighting fixtures are typically designed for lighter irises, which may not provide sufficient brightness for those with darker irises.

Reason 3: Lack of Natural Light
Natural light is beneficial for the eyes, particularly during the winter months when sunlight is scarce. Common light sources are composed of a mixture of red, green, and blue primary colors, whereas full-spectrum eye-care lamps can truly emulate natural light and reduce the harmful effects of blue light on the eyes.