Defines: - a set of standard names used to identify data that are measured by Ophthalmic Instruments; - a set of standard names used to identify other standard Parameters that are used and measured by Ophthalmic Instruments; - a set of Communications Capabilities that shall be and may be supported by all conforming instrumentation; - a mechanism by which conforming instrumentation may report an instrument-specific set of control and reporting capabilities for use by an external computer system.