Abstract: A device for positioning the curved surface of a lens beneath a radiuscope provides a variable distance between the lens surface and a pivot point for the lens to thereby accommodate lenses having different curvature radii. The device includes a pair of X- and Y-axis slides for providing adjustment of the lens in a horizontal plane. A first Z-axis slide connected to the X- and Y-axis slides enables the height of the lens relative to the radiuscope to be varied. A second Z-axis slide is pivotably attached to the first Z-axis slide. The lens to be examined is accommodated in a lens holder that is attached to the second Z-axis slide. Movement of the second slide along its translational axis varies the distance between the lens and the pivot point for the slide.