What are the ultraviolet rays?
- UVA, or near UV (315–400 nm)
- UVB, or middle UV (280–315 nm)
- UVC (100–280 nm)
Effects and uses of Ultraviolet Rays
Benefits of UV Rays:
- Triggers Vitamin D Synthesis: About 90% of vitamin D synthesis for the human is from subcutaneous absorption of UV rays.
- It is used for disinfection and Sterilization purpose.
- Exposure to sunlight helps to increase serotonin hormone release, which is responsible for boosting mood and helps the person feel calm and focused.
- Other benefits such as it provide navigation for some insects, helps in some of the animal’s vision.
Harmful effects of UV for Human Eyes:
Excessive sun exposure can damage human eyes in the following ways.
- Eyelid skin cancer
- Cornea and Conjunctival burn (Photokeratitis)
- Pinguecula or Pterygium (Growth of white mass on the eyes)
How to protect from harmful UV rays?
- Wear Sunglass (Having UV protection features)
- Wear a hat with a broad brim
- Apply Sunscreen