What light of the sun that can cause partial or total blindness?

The light of the sun that can cause partial or total blindness primarily comes from ultraviolet (UV) radiation. Prolonged exposure to UV rays can damage the retina and lead to conditions such as photokeratitis, cataracts, and macular degeneration. Additionally, looking directly at the sun, especially during events like solar eclipses, can cause solar retinopathy, resulting in permanent vision loss. It is essential to protect your eyes by wearing sunglasses that block UV rays when outdoors.