TY - GEN AU - Robert E Berger C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1976-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.76-996 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1976 TI - Testing for the impact resistance of ophthalmic lenses: ER -