Stage II is divided into stages IIA and IIB. In stage IIB, the tumor (1) has spread to the ciliary body and is size category 2 (12.1 to 18 millimeters wide and not more than 3 millimeters thick; or 9.1 to 15 millimeters wide and 3.1 to 6 millimeters thick; or not more than 12 millimeters wide and 6.1 to 9 millimeters thick); or (2) is in the choroid only and is size category 3 (15.1 to 18 millimeters wide and 3.1 to 6 millimeters thick; or 12.1 to 18 millimeters wide and 6.1 to 9 millimeters thick; or 3.1 to 18 millimeters wide and 9.1 to 12 millimeters thick; or 9.1 to 15 millimeters wide and 12.1 to 15 millimeters thick).