LONDON - Richard Burton said, "It's that long hair, that's what it is." He stroked the hair back from the face of Lisa Todd, Elizabeth's daughter, and looked into the girl's eyes. "It's that long hair getting into your eyes." He shook his head, pretending great solemnity. "We'll have to operate," he said. "The left eye definitely has something in it. We'll operate at...ah, four this afternoon, I think. Very serious." Lisa laughed and shook her hair back into her eyes. Burton took her by the hand and led her into his dressing room. "Gonzales is playing again this afternoon at Wimbledon," he said. "Did you see yesterday's match? It was rather better than 'Hamlet' - the old man against the young man."