optical illusion

American  

noun

1. illusion4

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optical illusion British  

noun

1. an object causing a false visual impression

2. an instance of deception by such an object

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Etymology

Origin of optical illusion

First recorded in 1785–95

Example Sentences

This is actually something of an optical illusion, for the options are not getting more expensive in terms of price as the earnings date approaches.

From MarketWatch • Apr. 9, 2026

It turns out that the abundant free cash flow that Meta reports to investors is something of an optical illusion.

From The Wall Street Journal • Feb. 23, 2026

Is a rat hole the same as an optical illusion deemed to be a holy image?

From Slate • Feb. 11, 2024

Due to the low angle of the Sun's rays, this can appear an optical illusion, as the pink wavelengths light up the base of the cloud.

From BBC • Feb. 2, 2024

But maybe there’s that optical illusion effect, too.

From "Keeping Pace" by Laurie Morrison