PREVAIL VII: Persistence of Ebola Virus in Ocular Tissues and Outcomes of Cataract Surgery in Survivors of Ebola Virus Disease is a prospective, natural history study to evaluate the persistence of Ebola virus in the eyes of Ebola survivors and assess the response to cataract surgery in survivors as compared to controls. This study will evaluate the safety and optimal perioperative protocols needed for cataract surgery performance in Ebola survivors.