Alcon AG reported on Dec. 9 that it had sweetened its offer for intraocular lens maker Staar Surgical Co., raising its offer by roughly 10% to $30.75 a share from its prior bid of $28 a share. The revised offer comes on the heels of the expiration of Staar’s go-shop period on Dec. 8, in which Lake Forest, Calif.-based Staar said no superior offers were received.