Optical Illusion: Can you read all the numbers in this image?

Try this optical illusion out to test your contrast sensitivity. Only a few have gotten it right—are you one of them?

Another optical illusion is making the rounds on Twitter, confounding people. It tells you how strong your contrast sensitivity is, which might come in handy in a variety of situations.

This image of a number within a spiral motif was provided by Twitter user @benonwine.

What's the secret?

Guess the number

Can you guess the number?

If you can't, don't worry, you're not alone.

Many Twitter users could only see the middle digits of the number. The most prevalent predictions were '4528' and '45283.' Some simply saw '528,' while others mistook the '4' for a '1' and estimated '15823.'

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The correct solution is '3452839.' Some people claim that seeing the image as a small thumbnail or blurring the image makes it easier to see the entire number.

Contrast sensitivity

The capacity to discern minute changes in shading and patterning is known as contrast sensitivity. Contrast sensitivity is necessary for recognizing items with fuzzy edges and differentiating objects or characteristics from their surrounds.

It's useful while driving through fog, and it also shows us if we have low contrast sensitivity, which can be a sign of cataracts or glaucoma.

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