It is important to wear sunglasses to prevent cataracts

Wearing sunglasses with proper UV protection is indeed an important measure to **reduce the risk** of developing cataracts, though it does not completely prevent them. Here's a concise breakdown:

1. **UV Radiation and Cataracts**: 

   Prolonged exposure to ultraviolet (UV) light, particularly UVB rays, contributes to cataract formation by damaging proteins in the eye's lens, leading to oxidative stress and clouding. The World Health Organization (WHO) estimates that up to 20% of cataracts may be linked to UV exposure.

2. **Role of Sunglasses**: 

   - Sunglasses labeled **"100% UV protection"** or **"UV400"** block harmful UVA and UVB rays, significantly reducing eye damage. 

   - Not all tinted lenses offer UV protection; darker tints without UV filters can worsen exposure by dilating pupils. 

3. **Additional Measures**: 

   - Combine sunglasses with **wide-brimmed hats for added protection. 

   - UV rays penetrate clouds, so wear sunglasses even on overcast days. 

4. **Other Risk Factors**: 

   Aging, genetics, smoking, diabetes, and nutritional deficiencies also influence cataract development. Prevention includes a holistic approach: quitting smoking, managing health conditions, and eating antioxidant-rich foods.

**Conclusion**: While UV-blocking sunglasses are a key preventive tool, they are one part of maintaining eye health. Regular eye exams and addressing other risk factors further safeguard against cataracts.