Figure legends
Figure 1. Classification, principle and application of light source in biomedicine.
Figure 2. The clinical application of light exposure.
Figure 3. The main principles of light application in biomedicine.
(A) Photosensitizers absorb blue light and UVA and then modulate mitochondrial ROS production and affect oxidative stress, metabolism, apoptosis and DNA oxidative damage. (B) UVB causes direct damage to DNA production and can produce cancer-inhibiting effects after light absorption by exogenous photosensitizers. (C) UVB through the skin to achieve the regulation of Vitamin D affects Calcium phosphorus, through the absorption of photosensitizers in the organism can achieve therapeutic effects. (D) UV, blue light and laser are transmitted through eye - nervous system - hypophysis - spine to endocrine organs to achieve endocrine and biorhythmic effects.