The test that determines how to tell if you need glasses
If your eyesight's been a bit poor lately and you're wondering how to tell if you need glasses, you’re in luck – a group of students from the Massachusetts Institute of Technology have created an optical illusion to test for vision impairment.
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So before you call the optometrist, position your head about 30 centimetres from your screen, then check out the picture below.
Do I need glasses?
Now, is the person you see Marilyn Monroe? If yes, you may want to book that appointment.
Do you see Albert Einstein instead? Chances are your vision is in pretty good nick.
ASAP Science explains the read glasses test: "Depending on how well you're able to focus or pick up contrast, your eye will only pick out details. Up close, we're generally able to pick up fine details like Einstein's moustache and wrinkles. But as the distance increases, or if your vision is poor and creates a more blurred image in the first place, your ability to pick up details fades away."
Did you see Albert or Marilyn?