THIS mind-boggling illusion used to demonstrate what people with colourblindness can see has blown the minds of social media users. All you have to do is stare at the middle of the green, yellow ...

A head-scratching optical illusion challenges the perception of color and how the brain plays tricks on us. In an image created by the UK contact lens vendor Lenstore, a series of lilac letters ...

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond ...