With 6,230 visitors, last month's Hong Kong Optical Fair saw the number of buyers up by nearly 9 percent. More than half of the visitors came from outside Hong Kong, mainly from the rest of Asia. This category showed a 21.3 percent increase to 2,533 persons. Attendance from Europe recorded an increase of 24 percent to 579, followed by visitors from North America with 319 persons. The number of Latin American buyers doubled. Attendance from the Middle East is up 50 percent. The most successful products were metal frames, particularly in titanium.