پیری نوری به آسیب و پیری زودرس پوست گفته میشود که عمدتاً ناشی از مواجهه طولانیمدت و تجمعی با اشعه ماوراءبنفش خورشید (UVA و UVB) و تا حدی نور مرئی با انرژی بالا است. This type of aging is completely preventable and has clear differences with intrinsic (natural) aging.
The main features of photoaging
- Starting earlier than natural aging (even from the second decade of life in people with light)
- Deep and defined wrinkles (especially frown lines, forehead lines, crow's feet around the eyes)
- Skin laxity and sagging (due to severe elastin destruction)
- Brown spots, sun freckles and melasma
- Rough, dry, leathery skin (especially on the face, neck, back of hands and chest)
- Capillaries Enlarged (telangiectasia) and permanent redness
- Solar elastosis (abnormal and damaged accumulation of elastin in the dermis)
Main scientific mechanism
UVA and UVB rays → production of free radicals and reactive oxygen species (ROS) → activation of matrix metalloproteinase enzymes (MMP-1, MMP-3, MMP-9) → rapid degradation of collagen and elastin → severe reduction of hyaluronic acid and glycosaminoglycans. class="wp-block-table">
| Feature | Intrinsic (natural) aging | Optical (solar) aging |
|---|---|---|
| Main cause | Time and genetics | UV radiation sun |
| wrinkles | fine and superficial | deep and defined |
| skin color | bright and uniform | spotted, brown, red |
| skin texture | thin and dry | rough, leathery, Loose |
| Preventable? | No (can only be slowed down) | Yes – almost complete with sunscreen |
Conclusion: Photoaging is responsible for about 80-90% of visible signs of facial skin aging in people over 40. بهترین و مؤثرترین راه پیشگیری، استفاده روزانه و مداوم از ضدآفتاب با SPF 50+ و PA++++ حتی در روزهای ابری یا داخل خانه است.
