Patent ID: 7689313

Claim:
A method of recording data monitored during the manufacture of molded ophthalmic lenses, the method comprising the steps of: identifying a set of process parameters used in said manufacture; for each of the process parameters, identifying an associated value range; monitoring each of the process parameters during said manufacture; if, during the manufacture of one of the ophthalmic lenses, one of said process parameters moves outside the associated range, then rejecting the one of the lenses; and if, during the manufacture of one of the ophthalmic lenses, all of the process parameters stay within their associated range, then identifying said one of the lenses as acceptable, and making a device history record for said one of the lenses, said device history record including a reference code for identifying the set of process parameters wherein the device history records include data items, and further comprising the steps of: forming a shadow table; copying into the shadow table data items from the device history records in response to the occurrence of predetermined events, wherein said predetermined events include whenever anyone accesses one of the device history records to perform any of a group of predefined operations on the data items in said one of the device history records; placing in the shadow table a reference code identifying whenever any person accesses one of the device history records to perform a given operation on the data items in said one of the device history records identifying said person, and a reference designation identifying the given operation; preventing anyone not in a group of identified individuals from changing any data in the shadow table.