<prompt> If a person has visual acuity 66. At what distance will he be able to read 624 line?24 m36 m48 m60 m  <response>: Ans. a. 24 mVISUAL ACUITY MEASUREMENTPatient is made to read the letters from top downward usually from a distance of 6 m20 ftIf patient reads all letters from top to the 6 m lineIf patient reads all letters from top to the 24 m linerVA denotes as 66-denominator 6 denote that this line should be clearly read from 6 m and the patient also can read it from 6 m distant numerator thus has normal far visionVA denotes as 624-denominator 24 denote that this line should be clearly read from 24 m distance, but the patient reads it from 6 m distant numerator and thus had dimunition of far vision 