Question

An optician while testing the eyes find the vision of a patient to be 6 by 12 what by the sea mean

Answer 1

Vision is tested by using Visual Acuity chart.

By vision 6/12 he meant that letters in the chart should be read from 12 meters away but the patient is able to read it only from 6 meters away.

Answer 2

6/12 means the person can read the letters from 6 m which the normal eye can read from 12 m.

Step-by-step explanation:

• Visual acuity is the measurement of how clearly someone can see at a specific distance, usually 20 feet or 6 meters.
• The acuity is usually presented by two numbers that indicate how close a person will need to be to an eye chart to see the letters or symbols clearly, compared to a person with 'normal' vision would see.  
• The larger denominator, indicate  worse the eye sees, so a VA of 6/12 is half as good as 6/6.  

Hence, 6/12 means the person can read the letters from 6 m which                                the normal eye can read from 12 m.