optical delusion

plural optical delusions

1. datedA vision or image that is deceptive or misleading, such as an optical illusion or a trick of the light.

   1 more example

   I rubbed my eyes, thinking that I was the victim of some hallucination, or that the refraction from the intense light produced an optical delusion; and, as I did so, the flaming pillar slowly twisted and thundered off whithersoever it passes to in the bowels of the great earth, leaving Ayesha standing where it had been.

   1886 October – 1887 January, H[enry] Rider Haggard, She: A History of Adventure, London: Longmans, Green, and Co., published 1887, →OCLC