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What is the little device? The Optometrist puts it on your eyes, and he/she can find out your naked eyes' vision directly?


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What is the little device? The Optometrist puts it on your eyes, and he/she can find out your naked eyes' vision directly?

She told me my naked eyes' vision is about (L)10/20, (R) 10/20. which is very correct.

The device is no bigger than a cigar case.

 

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