Final Answer:
Cloudy, opaque areas on the lens that prevent light from going through the lens are known as cataracts.
Step-by-step explanation:
Cataracts are the relevant phrase from the question. Cloudy, opaque areas on the lens refer to the condition of cataracts.
Explanations:
Cataracts: The term "cataracts" is derived from the clouding or opacification of the eye's lens. In the context of the question, when the lens of the eye becomes cloudy and opaque, it impedes the passage of light through the lens, leading to vision impairment. Cataracts commonly develop with age but can also result from other factors such as injury or disease.
Calculation: No calculation is required for this question as it is a definition-based inquiry.