Final answer:
Cataracts are the formations on the lens of Harold's eyes. They are a clouding of the lens and can cause a loss of vision. Treatment involves replacing the lens with a plastic lens, and prevention includes UV protection with plastic sunglasses.
Step-by-step explanation:
The formations that Harold has on the lens of his eyes are called cataracts. Cataracts are a clouding of the eye's lens, which can lead to a loss of vision. The condition is age-related, and about 60% of individuals between the ages of 65 and 74 will develop cataracts. Treatment for cataracts involves replacing the lens of the eye with a plastic lens, which is an easy and successful procedure.
Prevention is also important to avoid the development of cataracts. Eye protection from UV rays is particularly effective in preventing cataracts, and wearing plastic sunglasses that block UV-B radiation is more effective than wearing glass sunglasses.