Title: Easy to use, convenient
Product review: This chart is easy to use. However, if it can have an instruction on how to use and what the numbers mean, that would be perfect. I had to go online and google to see how far away i need to hang this chart. I then had to find out what the numbers really mean when testing an eye. Also, if an instruction can mention what the light condition for using the chart, it would also make the user easier to use it.
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