What is meant by the listings?
One step of the social security process determines if are you disabled, if you meet a listing.
If you are disabled, you meet a listing, and it does not matter if there is work you might be able to do. For example, for social security purposes they consider a person to be legally blind if, with corrective lenses or glasses, your vision is 20/200 or less in your best eye. So if you are 20/200 in one eye and 20/100 in the other you do not need a listing level for blindness. If your peripheral vision is 20 degrees, meaning that you can only see straight ahead of you and not out to the side, you would meet a listing for blindness.
There are different listings, like listings for your musculoskeletal system would take into consideration herniated disks or amputation, they meet the requirements to get a listing. The social security website has a full list of what they consider disabled to get a listing. If you meet a listing or equal a listing, you are disabled and it does not matter if you can return to your past work. If you meet a listing but are still working, you do not meet a listing. For instance, someone who is blind who can work and makes a certain amount of money is not considered disabled under social security rule. If he stops working, he would be disabled and meet a listing. Only a small amount of people are found disabled based upon the listing. An applicant doesn’t have to meet a listing in order to be proven disabled.