Can you see what's hidden in this red circle? Some people can't
Jack O'Neil

The seemingly endless trend of online eye tests and optical illusions has plundered new depths.

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The newest sensation takes the form of an eye test - although we're not exactly sure the test created by Jack O'Neil has any scientific grounding.

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An image is overlaid onto a red circle, but can you see what it is?

Take the test, below:

Jack O'Neil

As you may have seen, it was a horse in the grass.

The test presumably tests our ability to perceive and differentiate between hues of red, meaning that people with protanopia, or red-colour blindness, would have difficulty with the test which only slightly varies in hue

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