What is the difference between a waterfall and cataract?

A waterfall is a steep, nearly vertical drop of water from a height. It occurs when a river or stream of water flows over a steep precipice, such as a cliff or a mountainside. Waterfalls are often found in mountainous areas, where the topography creates the necessary conditions for water to plunge downwards.

On the other hand, a cataract is a medical term used to describe a cloudy or opaque area in the lens of the eye. It is different from a waterfall in both its nature and occurrence. Cataracts are caused by the abnormal growth of cells in the lens, leading to the loss of transparency and the clouding of the vision. They are a common age-related condition, especially among older adults.