Abstract: A slide mechanism for use in transporting a stereoscope along a horizontal support arm of a photogrammetric instrument includes a member slidably mounted to a pair of support tracks cantilevered to the support arm. A clamping mechanism is used to lock the slide member in a first predetermined position on the support tracks and is unlockable to enable the slide mechanism to be moved along the support tracks to a second position.

Abstract: An improved refractor for use in the subjective examination of human eyes. Each half of the refractor includes a plurality of lens supporting disks, a hub assembly for rotatably supporting the disks, and a comb assembly to space the disks along the optical axis. One of the disks supports at least one set of 4 cross cylinder lenses. Each disk is coupled to a stepping motor for selective rotation. Each motor is, in turn, supported by a bracket which permits rotation equivalent to a partial motor step to insure alignment of the optical elements supported on the disks with the optical axis. The cylinder lenses supported on the disks are also rotated by a stepping motor. The Risley prisms of each half of the refractor are always positioned on the optical axis and rotated by stepping motors.

Abstract: An improved refractor for use in the subjective examination of human eyes. Each half of the refractor includes a plurality of lens supporting disks, a hub assembly for rotatably supporting the disks, and a comb assembly to space the disks along the optical axis. One of the disks supports at least one set of 4 cross cylinder lenses. Each disk is coupled to a stepping motor for selective rotation. Each motor is, in turn, supported by a bracket which permits rotation equivalent to a partial motor step to insure alignment of the optical elements supported on the disks with the optical axis. The cylinder lenses supported on the disks are also rotated by a stepping motor. The Risley prisms of each half of the refractor are always positioned on the optical axis and rotated by stepping motors.

Abstract: An ophthalmic instrument support is provided for supporting a container enclosing a portion of the ophthalmic instrument. The support includes a base, movable support apparatus and control apparatus for controlling the positioning of the movable support apparatus relative to the fixed support apparatus. The movable support apparatus permits pivotal movement of the container relative to the base when activated and inactivated by control apparatus.