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

It’s an optical illusion really, for the TTD options are not getting more expensive in terms of price as the earnings date approaches, but are remaining the same.

From MarketWatch • Apr. 30, 2026

Pilots often experience an optical illusion of a passing object that can make it appear to be traveling at great speed even if it is barely moving, officials have said.

From The Wall Street Journal • Feb. 22, 2026

Stormont officials have commissioned consultants to help address an "optical illusion" along a Belfast footpath that has caused pedestrians to trip and fall.

From BBC • Feb. 21, 2025

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

From Slate • Feb. 11, 2024

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

From "Keeping Pace" by Laurie Morrison