Argued May 8, 1997; Decided June 12, 1997 Appeal from the Supreme Court, Steuben County (Henry J. Scudder, J.) Burke, Albright, Harter Rzepka, L. L. P., Rochester ( Johnson S. Albright II and Matthew D. Nafus of counsel), for third-party defendant-appellant. Martin Iati, Rochester ( Valerie L. Barbic of counsel), for Corning Incorporated and another, respondents. Krenzer Galliher, P.C., Honeoye Falls ( Cyril A. Krenzer of counsel), for Raymond L. Felker, Jr., and another, respondents. SMITH, J. Plaintiff