Final answer:
Excessive visible light can lead to temporary night blindness, while repeated exposure to UV-B can cause cataracts, a leading cause of blindness. Preventative measures such as wearing UV-filtering sunglasses and maintaining proper intake of vitamins A and C can help protect the eyes. For certain conditions, regulated exposure to bright light can help manage circadian rhythms.
Step-by-step explanation:
Exposure to excessive visible light, such as the headlights on a car, can cause glare and temporary night blindness. This condition can be especially hazardous while driving at night, as the eyes may have difficulty adjusting from the bright lights to the darker environment, resulting in a temporary reduction in vision. Likewise, excessive exposure to UV-B radiation can lead to long-term eye damage, such as the formation of cataracts, which are a significant cause of blindness worldwide. Cataracts are a clouding of the eye's lens, which impairs the passage of light and can severely limit vision. Protective measures such as wearing sunglasses that filter out UV radiation can help prevent such damage. It is recognized that vitamins A and C may provide some degree of protection against the development of cataracts. In addition, devices that emit bright light are used in a controlled manner to help maintain a regular circadian rhythm for individuals working night shifts or for those affected by seasonal light variations.