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 USMLE Step 2 CK Forum USMLE Step 2 CK Discussion Forum: Let's talk about anything related to USMLE Step 2 CK exam

#1
03-17-2014
 USMLE Forums Newbie Steps History: Not yet Posts: 1 Threads: 1 Thanked 0 Times in 0 Posts Reputation: 10
Confusion related to VA

Hi
i am new here
i am struggling a lot to understand the concept of 20/20 or 6/6 vision
i tried to grasp it from difference resources but it doesnt make sense to me and hence it doesnt stick
please can someone explain it to me in the simplest comprehensive way as possible
i shall be really thankful
it may be a noob question to a lot of you but trust me i am reallt strugling with this concept

thanks

#2
03-17-2014
 USMLE Forums Addict Steps History: 1+CK+CS Posts: 194 Threads: 21 Thanked 147 Times in 85 Posts Reputation: 157

20/20 is the same as 6/6 vision (it's in metric units)
practically its testing the visual acuity of an eye.

a person can distinguish several details at watching a picture from a given distance practically a normal person can see a picture from a distence of 20 feet (6 meter) in a given size thats 20/20. when you increase the denominator hence 20/40 20/200, its like saying that in order for the person to see the same amounts of details from the same 20feet distance (the nominator) we need to increase the size of the object by 2 - hence 40.

increased denominator represents worse visual acuity.

hope it helpful, regarding the exam just remember my last sentence.
 The above post was thanked by: abeer (03-17-2014), api77 (03-17-2014), montre (03-19-2014)

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