Near-infrared refers to light with wavelengths longer than visible light but shorter than infrared (approximately 780nm–2500nm). Although invisible to the human eye, it is widely used in fields such as material analysis, medical diagnostics, skincare, and horticulture.

Yes, it is generally safe. Sunlight also contains near-infrared light, and it is harmless to the human body when used within safe limits. However, prolonged exposure to high-intensity NIR should be avoided.

No. It cannot be detected by the human eye, but it can be observed using special cameras or sensors.

Normal everyday exposure is not harmful, but looking directly at high-intensity NIR for extended periods should be avoided. In particular, when using experimental lasers or high-power devices, protective eyewear is essential for safety.

Yes. NIR is applied in household devices such as skincare equipment, LED masks, and thermal therapy devices. However, it is important to use only certified safe products.