Here is a document from the archives from Al Crabb.
Myth: Blind people live in a world of total darkness.
Fact: Only a small percentage of Legally Blind people see nothing at all. Darkness is the eye telling you that there is no light on. People who are (totally blind) do not have the ability to see light, or darkness. They see nothing at all.
Getting population statistics from the American Community Survey, in 2011 there were between 3,600 (11% of over 65) and 9,500 (11% of over 45) people with a severe visual impairment in Fayette County.
You can find the updated numbers, or numbers for your area by going to https://www.census.gov/acs/www, then click on Age and Sex/Aging; pick your geography – we usually do all counties in Kentucky – pick your topic – we choose Age & Sex – and then you can see your table/numbers.