This is a very sensitive subject. Most people view driving as a form of independence.
Giving up driving means that these people could not do simple things like going to the grocery store, bank or drugstore without asking someone else to drive them there. But this is a matter of public safety, for the elderly person and other people driving on the road.
New York State has minimum visual acuity standards to drive. The best corrected vision in one or both eyes must be 20/40 for an unrestricted license. For a restricted license, 20/70 is required in one or both eyes. There is also a visual field minimum of 140 degrees horizontally.