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Sight Test

If you believe that you have a visual impairment, the table below may give you an idea. The only thing you need to do is to determine how much you will move away from the monitor according to the size of your monitor and screen resolution and try to read the digits from top to bottom row closing one of your eyes respectively. If you have difficulties in reading, then you must consult to an eye doctor without losing time.  
Your distance according to screen resolution
Screen size Resolution 640x480 800x600
14 inch 5.5 m 4.0 m
15 inch 6.0 m 4.5 m
17 inch 7.0 m 5.5 m

This measurement does not replace the check to be made by a physician in any case.