the world > physical sensation > sight and vision > optical instruments > instruments to refract, etc., light > [adverb] > refractor
1732 A. Bower 3 363 To produce very extraordinary Effects..either dioptrically or catoptrically.
1849–52 IV. ii. 1441/2 Dioptrically-formed coloured margins.
1883 Carpenter in XVI. 266/1 at Microscope Images dioptrically formed of the general outlines and larger details of microscopic objects.