Abstract: An adjustable workpiece rotating assembly for rotating a workpiece of any of a plurality of configurations at a workstation positioned along a conveyor system. Workpiece carriers attached to the conveyor system allow the workpiece to be positioned thereupon at a desired orientation relative to the work station. A mouth piece and base cup engage opposite ends of the workpiece and cause the workpiece to be rotated about a longitudinal axis thereof. The mouth piece and base cup are supported by a vertical displaceable rack which engage with a rotatably spur gear to allow the mouth piece and base cup to be translated simultaneously in the vertical direction to engage with a workpiece of any one of different elevations.

Abstract: Instead of having the surgeon make cuts freehand in a radial keratotomy operation for correction of the refraction of the human cornea, there is provided a fixation ring which has an eccentrically located band or bridge, the side of which is toward the middle of the ring is formed as a vertical, planar positioning and guide surface, extending vertically with respect to the plane of the ring. This bridge can be mounted on the ring itself or fastened onto an inner ring that is freely rotatable with respect to an outer ring. Means for limiting the depth of the cut may also be provided. This makes it easier to obtain straight and regular cuts in the desired radial direction. Operations can be completed more quickly, and there is a better prognosis for obtaining the desired results in the operation.