The intense solar radiation coming from the bright crescent during the solar eclipse Aug. 21 can cause long-term or permanent blindness.
The American Astronomical Society recommends proper eye protection to prevent eclipse blindness.
Without it, the sunlight can trigger a series of chemical reactions in the retina, a layer at the back of the eyeball containing cells that are sensitive to light.
Observing the eclipse with a camera, a binocular or a telescope also has its risks. NASA experts suggest users to practice before the event to make sure that no mistakes are made.
- The filters need to be in good condition. Look out for scratches, bubbles or dents.
- Make sure your handheld viewer covers both eyes.
- Sunglasses are not enough protection.
The goggles must be made out of polyester film coated in aluminum or black polymer.