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Prolonged exposure is associated with the development of skin cancers, photoaging or premature skin aging, immune suppression, and eye diseases like cataracts. [14] [15] Given these dual effects, public health organizations emphasize the importance of striking a balance between the benefits and risks of UV exposure.
Given the causal relationship between sun exposure and AK growth, they often appear on a background of sun-damaged skin and in areas that are commonly sun-exposed, such as the face, ears, neck, scalp, chest, backs of hands, forearms, or lips. Because sun exposure is rarely limited to a small area, most people who have an AK have more than one. [10]
Light therapy, also called phototherapy or bright light therapy is the exposure to direct sunlight or artificial light at controlled wavelengths in order to treat a variety of medical disorders, including seasonal affective disorder (SAD), circadian rhythm sleep-wake disorders, cancers, neonatal jaundice, and skin wound infections.
Long-term sunlight exposure is known to be associated with the development of skin cancer, skin aging, immune suppression, and eye diseases such as cataracts and macular degeneration. [55] Short-term overexposure is the cause of sunburn, snow blindness, and solar retinopathy.
Severe sunburn when exposed to only small amounts of sunlight. These often occur during a child's first exposure to sunlight. Development of many freckles at an early age; Rough-surfaced growths (solar keratoses), and skin cancers; Eyes that are painfully sensitive to the sun and may easily become irritated, bloodshot and clouded
The effect of sunlight on folic acid levels has been crucial in the development of dark skin and favored the emergence of skin pigmentation in order to protect from folate depletion due to the increased exposure to sunlight. [6] [10] [27] [28]
UVA rays are able to penetrate deeper into the skin than UVB rays, damaging the dermal layer as well as the epidermal. The dermis is the second major layer of the skin and it comprises collagen, elastin, and extrafibrillar matrix which provides structural support to the skin. However, with constant UVA exposure, the size of the dermis layer ...
The skin response resembles an exaggerated sunburn. The involved chemical may enter into the skin by topical administration, or it may reach the skin via systemic circulation following ingestion or parenteral administration. The chemical needs to be "photoactive," which means that when it absorbs light, the absorbed energy produces molecular ...