🧴 Sunshine and Skin: A Love–Hate Relationship
We all know that the sun gives life — but it also has the power to silently age and damage our skin. While a sun-kissed glow may look healthy, the truth beneath the surface tells a different story. Sun protection isn’t just about avoiding sunburn; it plays a crucial role in slowing down the visible signs of ageing.
“Sun protection can decelerate skin ageing.”
— Dr. Tan Kian Meng
Ageing is a natural part of life. Wrinkles, fine lines, and hyperpigmentation are inevitable as the years go by. However, there’s one major factor that speeds up this process — photoageing.
Photoageing refers to the adverse effects on the skin caused by exposure to sunlight and ultraviolet radiation (UVR). Studies show that 80% of visible skin alterations come from cumulative sun exposure (Figure 1).
Figure 1: Effects of Sun Exposure on Skin
Among the ultraviolet rays, UVA (320–400 nm) — which makes up 95–98% of UV radiation reaching Earth — is the main culprit of photoageing. Unlike UVB, UVA penetrates deeply into the dermis and damages collagen and elastin fibers through oxidative stress.
⚖️ UVA vs. UVB — Different Rays, Same Risk
While UVA rays are the prime drivers of photoageing, UVB rays (280–320 nm) also play a damaging role. Though they account for only 2–5% of the sun’s emissions, UVB rays penetrate the epidermis and can directly damage DNA, sparking the creation of reactive oxygen species (ROSs) — harmful molecules that weaken skin cells.
UVA = Deeper, longer-term damage
UVB = Surface-level, DNA damage
Both UVA and UVB contribute to oxidative stress, but UVA is more cytotoxic (damaging to cells), while UVB is more mutagenic (likely to cause genetic changes). Because UVA penetrates deeper into the skin, it’s the bigger culprit behind long-term collagen breakdown, loss of firmness, and premature wrinkles.
🌤️ Guarding Against the Invisible Enemy
Guarding against the sun is more than a cosmetic choice — it’s a scientific necessity.
Simple steps like:
✅ Applying sunscreen daily (SPF 30 or higher)
✅ Reapplying every 2–3 hours outdoors
✅ Wearing wide-brimmed hats or protective clothing
✅ Seeking shade between 10 AM and 4 PM
…can make all the difference in preserving youthful, healthy skin.
“Radiant skin doesn’t come from avoiding the sun — it comes from respecting its power and protecting your skin wisely.”
In Conclusion
Guarding against the sun is more than a cosmetic concern — it’s a scientific necessity. Understanding how UVA and UVB rays affect our skin allows us to take smarter steps in protecting it. Daily sunscreen application, seeking shade, and wearing protective clothing are simple but powerful defenses against photoageing.
After all, radiant skin doesn’t come from avoiding the sun entirely — it comes from respecting its power and protecting your skin wisely.
Written By: Dr. Tan Kian Meng, PhD in Engineering Technology (UTHM)
