Key PointsHe lowered his fair value assessment by $100 per share.However, due to recent price weakness, among other factors, he maintained his buy recommendation.10 stocks we like better than Ciena › A significant price target reduction by an analyst was a headwind buffeting Ciena (NYSE: CIEN) on the second trading day of the week. The $100-per-share cut drained optimism for the tech stock, and its price fell by nearly 9% during the day's tradin…