Abstract: A precisely movable mirror mount has a mirror pivotally supported on an elongated member. The member is rotationally supported by a support spaced along the member from the mirror, the support also supporting a winch. One end of a strand is windingly connected to the winch and the other end of the strand is connected to the mirror for rotating the mirror in one direction against a bias device which urges mirror rotation in the other direction. The strand mirror-rotating arrangement makes the device slim and thus visually non-distracting and the spacing to the member and winch support minimizes noise at the mirror to make the device audibly non-distracting, both of which are important to the preferred use of the device in a visual field tester in which the patient is close to the device.