The Department of Homeland Security rejected an employee’s application to transfer to a position as a detention enforcement officer on the ground that he had limited vision in one eye because of an earlier injury. His request for an eye re-examination was also rejected. The DHS also noted that detention enforcement officers were required to have a commercial driver’s license, which required better vision than the applicant demonstrated. Was the applicant disabled? Is the DHS guilty of disability discrimination? Were the vision rules job-related?