Optical illusion test: Only 2% with 20/20 vision can find the odd number in 5 seconds

Optical illusion challenge: Are you ready to challenge your brain and sharpen your observation skills? This optical illusion IQ test is designed to trick your eyes and test your mind’s ability to spot the smallest anomalies. It's said that only 2% of people with perfect vision can find the odd number hidden within the image in just five seconds. Let’s see if you belong to that elite group!


Optical illusions are cleverly designed images that mislead the brain by presenting something that looks different from reality. They exploit the way our brain interprets what we see, often creating fascinating and puzzling visual experiences.

While they may seem like fun puzzles, optical illusions have deeper scientific value. Psychologists and neuroscientists use them to understand how the brain processes visual information, attention, and even decision-making. These illusions show that our perception isn’t always accurate—it’s shaped by past experiences, assumptions, and the brain’s attempt to fill in gaps.


Regularly solving optical illusion IQ tests can improve your observation skills. These puzzles train the brain to focus on minute details and think outside the box. They also encourage you to shift your perspective—literally and figuratively—to view things differently.

From art and design to artificial intelligence and robotics, the insights gained from how we perceive optical illusions are influencing a wide range of fields. For instance, designers use illusions to create eye-catching visuals, while AI developers study human perception to build smarter, more adaptive systems.



Today’s visual challenge is simple yet mind-boggling. Among the sea of identical-looking “45” numbers, one number is different. Your task is to find the odd number—but here’s the twist: you only have 5 seconds to do it!

Instructions for the IQ Test:

Set a timer for 5 seconds.

Focus on the image and scan from left to right, top to bottom.

Ignore the number 45 for a moment and look for anything unusual.

The odd number will look similar to the rest, so pay close attention to even the tiniest differences.

Struggling to see it? Try squinting or using your peripheral vision.

Changing your viewing angle might also help.

This optical illusion is designed to test your visual sharpness and your ability to notice subtle patterns. It’s not just about what you see—but how you process what you see.


If you’ve managed to find the odd number within five seconds, congratulations! You likely have above-average observation skills and a quick-processing brain. Very few people spot the odd one out without help, which makes this a great way to test your visual intelligence.


Ready to check your answer? Scroll down to see where the odd number was hidden in the image.


Whether you got it right or not, engaging in challenges like these is a fun and effective way to boost your cognitive skills, improve focus, and sharpen your attention to detail. Keep trying similar puzzles to further strengthen your mind.

This optical illusion IQ test wasn’t just a fun activity—it was a powerful exercise in brain training. By practising with illusions like this one, you’re not only entertaining yourself but also enhancing your observation skills and cognitive performance.

Why not share this challenge with friends and see who can beat the 5-second mark?

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