Initially the cataract changes the focusing power of the eye , and a change of glasses can satisfactorily improve vision. Gradually, clarity drops so that visual tasks become increasingly difficult, despite the best possible glasses. A person with cataract views the world as if through a dirty window or a windshield that needs defrosting.
Glare becomes a serious problem.
Color perception becomes muted. Reading, driving, computer work, hobbies, and athletics become less easy and eventually impossible due to diminished vision.