More than 500,000 Walgreens-branded eye-drop products are being recalled over sterility concerns as part of a broader recall involving nearly 750,000 eye-care products.Sterling Pharmaceutical Services LLC, based in Dupo, Illinois, initiated the recall on Aug. 20 because of a "lack of assurance of sterility," according to a U.S. Food and Drug Administration (FDA) enforcement report.The FDA classified the recall as Class II on Sept. 21. The designation means use of or exposure to the affected products may cause temporary or medically reversible health consequences, while the probability of serio...