You probably know whether or not you're near-sighted, but some people get so used to seeing things a certain way that they ignore a vision problem, squint a lot, and end up with unnecessary eye strain at the computer. This double-image cuts straight to the point:
Normal vision people will see Einstein.
Short sighted people will see Marilyn Monroe.
Sick minded people will see Marilyn with a moustache.
If you aren't near-sighted and you want to see the image how near-sighted folks do, you can squint or just walk away from your computer until you see Monroe.
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