What is 20/20 Vision?
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Visual acuity is typically measured with the use of a standard eye chart called the Snellen chart. It was devised by Dr. Hermann Snellen, a Dutch Ophthalmologist, in 1862. It was originally used at a standard distance of 6 meters, which is about...
Read more about it here
Scroll down until you see the Snellen chart. Yes, the one that you have to look at when your health booklet has to be checked in primary school.
Well at least its stuff that I never knew. "Godma" gave us this site for circular aperture diffraction stuff but well as you surf there are always interesting things that you find out!
:) (why am I smiling when I owe my godma 4 lab reports and a 45 minutes VIVA? ccb...)
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