Sitting at your computer all day can cause a lot of stress on your eyes and you may not even realise it. Taking regular breaks can help with the situation but still people don't do this.
This image is supposed to test your eye sight and check if you need glasses or not.
If you see Albert Einstein while sitting normal distance from your computer, you're seeing things as you should. However if you see Marilyn Monroe you better get down to your local opticians.
Also to people seeing things as they should, you should see Marilyn Monroe if you move a few metres away from the screen or when the image is smaller.
It's a great little test which came from someone named Aude Olivia from MIT.