When rating vision, how would you convert from the 20/20 system to the degrees system?

Question

When rating vision, how would you convert from the 20/20 system to the degrees system?

Answer 1

Page down to where you see "Normal Vision".

Hope this helps.

http://en.wikipedia.org/wiki/20/20_visio...

All visual acuity letters on the snellen chart subtend a specific angle of arc at a given distance that can be expressed in degrees.  The degree of the arc subtended is specific to the acuity rating of the letter.  For instance, a 20/80 letter will subtend a larger degree of arc angle than a 20/20 letter.