You have 20/20 vision if you can find the animal hidden among the lines in this optical illusion within 20 seconds

READERS might be able to say they have 20/20 vision if they manage to spot the hidden animal in this fiendishly difficult riddle.

Viewers scramble to spot the cat lurking behind the black and white lines.

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But they are in a race against the clock as they are challenged to spot the cat within 20 seconds.

After scanning the black and white image, the heads are adjusted to rotate.

The cat is extremely difficult to spot, but a shake of the head is enough.

If you shake your head frantically, you should be able to see the animal’s piercing eyes before you can make out its features.

The startling illusion went viral, with social media users commenting on how they spotted the cat.

One Twitter The user said, “Just shake the phone. It’s easier than your head.”

Another claimed: “I see it without shaking my head or the phone, with both eyes open or even with one eye closed.”

Players indicated that tilting their cellphone is the preferred option, especially when they are on the go.

While social media users said they felt nauseous after trying to spot the cat by shaking their heads.

Some said they could see the creature without shaking their heads or tilting their phones.

If this illusion has you reeling, why not try to spot the deadly sniper roaming the mountains in less than 20 seconds?

Readers looking for a challenge should try to find the hidden letter Y in this brain teaser within five seconds.

Viewers may be able to tell they have 20/20 vision when they spot the number eight in this math puzzle.