Subject: To measure your own visual acuity, you need to measure it yourself with these charts.
Here are two “Eye Charts” or Snellens you can use at 20 feet.
Block Letter Snellen Chart.
http://www.i-see.org/block_letter_eye_chart.pdf
It is very important that this be permanent – and that you put a bright light on it.
Vision varies quite a bit – so long-term monitoring is required to get a reasonable judgment – of your visual acuity.
For continued review of the use of the plus (for prevention), please log onto these two sites:
http://gettingstronger.org/
“Discussion”
http://forum.gettingstronger.org/index.php