Top female apprentice Willy W. Y. Kan will have exploratory eye surgery following a summer fall in England that has left her with intermittent double vision. The young claimer shot to stardom last term with a string of successes for trainer Brian Kan Ping-chee, who has carefully masterminded her early career. Kan joined the northern English stable of Dandy Nicholls in the summer and suffered a concussion when she fell after winning an apprentices' race. She was stood down for a month by the English Jockey Club and returned home to Hong Kong. Trainer Kan said yesterday: 'She is going into hospital at the weekend and is due to have an operation. She is a good girl with a good future but this problem must be solved.' She looks certain to be on the sidelines for several months. Race fans are also going to see more of Sherie Kong-Legrix on television rather than on the racetrack in the coming weeks. The Jockey Club announced yesterday that Kong's indentures had been extended from July 1 to June 30 next year with Patrick Biancone, but her immediate racing duties will see her working for Jockey Club television on Sunday. Kong has had recurring kidney problems and will not be seen in the saddle for several months. 'She is not able to ride horses now because of the medication she is receiving for the kidney problem,' said Biancone. 'I do not expect her to be riding for quite some time. The kidney problem is the same as happened to Jonah Lomu, the New Zealand rugby player, who was out of action for more than a year. 'There is just no time limit on it at the moment,' explained Biancone last night. With Win L. F. Chung now a work rider after giving up on race riding, it leaves the inexperienced Carol Y. S. Yu flying the distaff banner when the new racing season opens its doors on Sunday. Meanwhile, the Macau Jockey Club has secured the off-season services of another former Hong Kong jockey who was a hit with the public here. English ace Darryll Holland will join compatriot Willie Ryan at Taipa for three months this winter, with the unwanted Paddy Payne due to ride there starting in the middle of November. Brilliant Macau rider Peter W. H. Lao, widely held to be the best Chinese jockey in these parts, will have three mounts at Randwick in Sydney tomorrow at the inaugural Macau Goodwill Day.