A publication is considered in Open access if:
Open Access - a complete version of the work and all supplemental materials, including a copy of the permission in a suitable standard electronic format is deposited immediately upon initial publication in at least one online repository that is supported by an academic institution, scholarly society, government agency, or other well-established organization that seeks to enable open access, unrestricted distribution, interoperability, and long-term archiving (for the biomedical sciences, PubMed Central is such a repository). (PLOS)
Research impact is the contribution that research makes to the economy, society, environment or culture, beyond the contribution to academic research. (Australian Research Council)
Research impact is the beneficial application of expertise, knowledge, analysis or discovery and the effect on, change or benefit to the economy, society, culture, public policy or services, health, the environment or quality of life, beyond academia” (REF 2014)