The Times of London reported the English Blind Golf Association began the inquiry into David Morris after he became the first player successfully to defend the title at the competition in Melbourne, Australia.
The inquiry began after a complaint to the association that the 61-year-old Morris may have had an advantage over his rivals in the category for totally blind golfers.
The criterion for blindness is that competitors are unable to recognize the shape of a hand at any distance.
Association spokesman Barrie Ritchie said Morris was tested before joining the association and had provided medical evidence to support his application.
Morris, who is currently traveling to Japan for the Blind Open Tournament starting Friday, has been told of the complaint but was unavailable for comment.