 Valproic acid, a drug that is FDA-approved to treat epilepsy, has shown promise for preserving vision in people with certain forms of retinitis pigmentosa.The Foundation has launched a human trial to test this drug and, if effective, move it quickly out to patients who need it.Foundation-funded researchers are using stem cells derived from a variety of sources, including a person's own skin, to create healthy retinal cells that can potentially restore vision.