SUNSCREENS

Sunscreens are products which prevent ultraviolet rays from being absorbed by the skin. they are available in the form of creams, gels, lotions, sprays and now even capsules.

Let us first understand these rays. Solar radiation comprises UV rays, visible light and infrared rays.

Wavelengths less than 320nm are absorbed by the upper layers of the skin., namely the stratum corneum and the epidermis.

UV rays that reach the earth’s surface comprise UVA (320-400nm) and UVB (290-320nm) rays. Visible rays are at about 400-800nm and infrared rays are anything above 800nm.

Now its time to understand the SPF game

SPF or sun protecting factor is a measure of protection from UVB rays. A higher SPF is recommended for Caucasian skin as it is more prone to skin cancer.

SPFProportion of UVB blocked (per cent)
1593
2095
3096.7
4097.5
5098.3

For Indian skin types, it is essential to look at the PA value which indicates protection from UVA rays.

PAProtection from UVA rays
*Fair
**Moderate
***Good
****Excellent

For regular use, one should opt for a sunscreen with SPF 30 and PA***

  • If you have dry skin, use a cream-based sunscreen.
  • If u have oily skin, use a gel-based or matte sunscreen.
  • For a larger surface areas, use a lotion or a spray.

How much sunscreen should one apply?

Face and neck1/2 teaspoon (3ml) of sunscreen
Each arm1/2 teaspoon (3ml) of sunscreen
Each leg1 teaspoon (6ml) of sunscreen
Feet1 teaspoon on both feet
Chest1 teaspoon
Back2 teaspooons to full back

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