Robert Blair was the first Regius Professor of Astronomy at the University of Edinburgh (1785 until death). He invented the aplanaticlens and also coined this term. This was a significant step in reducing the aberration in optical systems. He also experimented with hollow lenses, holding different solutions.
Jean Eisenstaedt, "Light and relativity, a previously Unknown Eighteenth-Century Manuscript by Robert Blair (1748–1828)", Annals of Science, 62 347-376 (2005).
Jean Eisenstaedt, Avant Einstein Relativité, lumière, gravitation, Paris, Seuil (2005).