A rare form of eye cancer has struck a group of people in two locations in North Carolina and Alabama, confounding medical experts who are trying to determine whether the cases are linked. Ocular melanoma typically affects 6 out of every 1 million people, but doctors have found dozens of cases where those affected have ties to either Huntersville, N.C., or Auburn, Ala. Many of those diagnosed attended Auburn University between 1983 and 2001 — at least three of them were friends. At least 38 people who went to Auburn have reported being diagnosed with the disease, according to a...