Thursday, January 3, 2013

Does the focal length of lens measure eyesight?

I have -2 in left eye and -2.5 in the right eye. Does that mean I have 20/200 vision according to http://www.mdsupport.org/library/acuity.html ?
Added (1). Last time I was tested I am sure I got first, second and third lines correct.It must be false.
Added (2). In Snellen chart that is
http://en.wikipedia.org/wiki/File:Snellen_chart.svg
>>> Does the focal length of lens measure eyesight?