Final answer:
A cataract is cloudiness in the lens of the eye. Light is scattered or diffused by it, causing blurred vision.
Step-by-step explanation:
A cataract is cloudiness in the lens of the eye. Light is scattered or diffused by it, not dispersed. When light enters the cloudy lens of the eye, it scatters in different directions, causing a blurred vision. This is why people with cataracts have difficulty seeing clearly.