(Continuation from yesterday)

I don't know the detailed specifications of this optometer, however,

- I manipulate the stick strongly like a flash without hesitation or anxiety, at the moment of appearance of the arc.

and if I get the direction wrong, the same size of arc is coming soon,

- I select one of the other directions if I look like same shape, or I select the same direction if I look like different shape.

The more I try the above procedures, the higher the odds will becomes (no evidence).

This is the same approach of "downed submarine searching problem", which is famous for a merit of Bayes estimation ( the next estimation uses the wrong estimation before)

I want to name this method that I came up with,

"Bayes eyesight test method"

In addition, I want spread this method in the world, that name will be "Ebata pseudo eyesight problem", like "Monty Hole problem". I hope I need your help earnestly.

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By the way, I asked my wife "If you cannot watch the arc, could you push the "unknown" button?" and she said rapidly,

"No way. It is kidding"

"Of course, I will fight to the end."