This experimental study was performed to mold fine spherical lenses by using the injection molding machine which was equipped with a control system of a cavity pressure profile, an ultrahigh injection system, and a system of mold vacuumization. For this purpose, effects of injection time, filling pressure, and holding time as processing variables on molded parts were investigated by measuring weights and radii of curvature, spherical accuracies, and interference figures of curved surface errors. As results, the filling pressure had shown the great influence on both weights and the radii of curvatures; injection and holding times had no effect on the curvature while they contribute to the increase of weights with lengthening the process cycle time, which is not desirable. Also, spherical accuracy measurement had shown that there exists a good molding window, comprised of the medium range of a holding time (15∼30 seconds), a fast injection time within 4 seconds, and a high filling pressure more than 860 kg/cm². Finally, it was found that interference figures were believed to be a very powerful tool in studying molded objects.