Definition

Stage I is divided into stages IA and IB. In stage IA, the tumor is 10 millimeters or smaller and may have spread to the edge of the eyelid where the lashes are, to the connective tissue in the eyelid, or to the full thickness of the eyelid. In stage IB, the tumor is larger than 10 millimeters but not larger than 20 millimeters and has not spread to the edge of the eyelid where the lashes are or to the connective tissue in the eyelid.