Abstract: A series of units for manual use or for use in combination with a standard lensometer for evaluating the parameters of soft or flexible contact lenses. The units comprise convexly disposed hemispheres of graduated diameters comprising rigid or semi-rigid material, each of which has a round central aperture and is marked on its convex surface with a series of concentric calibration circles. In preferred form, each of the convex hemispheres is integrally formed with a flat supporting plate, with the convex side protruding and the concave interior having an internal dimension which accommodates any conventional lensometer or similar lens testing instrument. The soft lens whose curvature is to be measured is placed by trial and error on successive inspection and measuring units until the curvature matches or falls between two units of known radii.