CooperVision recalled hundreds of thousands of Avaira Toric contact lenses, according to Oct. 13 reports, the eye care company's second recall announcement in two months. The latest recall involved 600,000 contact lenses that entered the U.S. market, though more than 8 million were said to have been affected by the problem. The recall was instituted because wearers complained of pain, red eyes, and blurry vision. MSNBC reported that some people wearing the Avaira Toric contact lenses necessitated visits to the emergency room because they were in such excruciating pain. Wearers' symptoms were caused by a residue on the lenses, which resulted from a manufacturing problem. CooperVision said it "has fully cooperated with the FDA and continues to closely monitor the situation." It notified customers, and told eye care practitioners to inform their patients about the recall.