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Test your eyesight
Can do Like an eye test by an optician you can prove your eyesight on an party.
There are circles with openings either left, right, up or down.
The first canals are large symbols its very simple.
When you have discovered the first three circular openings properly be the circles with openings smaller and it is more difficult.
When you have discovered the second four circular openings properly be the circles with openings smaller and it is more difficult again.
In total there are 7 lines be queried until the last line of the smallest circles
Look how far you get
If an incorrect answer you fall back