Are the bright lights that cyclists now use safe for the eyes of onlookers?
• Many people permanently damage their eyesight by looking at the sun through binoculars. The damage is done not by the light, but by the heat from the infrared radiation in the sun’s rays. The lens in the eye focuses both the visible light and the invisible heat on to the light-sensitive cells at the back of the eye. The heat is so strong that cells can overheat and be damaged in only a second.
The bright lights used by cyclists are LEDs, which produce a lot…
