What is the fine-grained topic of the following text: With its converted McDonnell Douglas DC-10-30CF – already equipped with STG Aerospace’s saf-Tglo® emergency floor path marking system – Orbis transports the most advanced ophthalmological knowledge, surgical skills and facilities across Africa, Asia and Latin America. Only return the topic.
Orbis' use of McDonnell Douglas DC-10-30CF for ophthalmological services delivery