November 7, 2013 | POSTED BY | Clinical Pearls
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A classmate of mine shared an easy way to convert visual acuity measured in feet to meters. Simply remove the first zero you see in both the numerator and the denominator, and then multiply the numerator and denominator by 3.

 

For example: 20/30

Step 1: Remove the first zero you see in both the numerator and the denominator

  • 2/3

Step 2: Multiply the numerator and denominator by 3

  • (2*3)/(3*3) = 6/9

 

Another example: 20/100

Step 1: Remove the first zero you see in both the numerator and the denominator

  • 2/10

Step 2: Multiply the numerator and denominator by 3

  • (2*3)/(10*3) = 6/30

 

Note: This trick does not work for 20/15 or 20/25.

 

 

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