A paralegal who alleges his poor vision and depression prompted the Social Security Administration to discriminate against him does not have a case under the Americans with Disabilities Act, a federal appeals court ruled.In a nonprecedential order Monday, the 7th U.S. Circuit Court of Appeals declined to revive the lawsuit Kevin D. Miller filed after the Merit Systems Protection Board upheld his demotion to a lower-paying position.Miller is not a “qualified individual with a disability” as defined by the ADA and, therefore …