A variable focus lens comprising a first fluid (A) and a second,
non-miscible, fluid (B) in contact over a meniscus. A first electrode (2)
separated from the fluid bodies by a fluid contact layer (10), and a
second electrode (12) in contact with the first fluid to cause an
electrowetting effect whereby the shape of the meniscus is altered. The
fluid contact layer has a substantially cylindrical inner wall.