VARIABLE FOCUS LENS AND SPECTACLES

摘要

The invention provides a variable focus lens. The lens is formed from a ring (120) with a front surface (122) and a rear surface. A flexible membrane (140) is attached to a radially inner part (124) of the front surface, and a front cover (150) is attached to a radially outer part (126) of the front surface. A rear cover is provided on the rear surface of the ring, preferably integral with the ring, so that a variable volume cavity is defined between the flexible membrane, the ring and the rear cover. A second flexible membrane can be provided between the ring and the rear cover. The invention also provides a method of filling a variable focus lens, and an adjustment mechanism for varying the focus of the lens.