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Use the grid in a well-lighted area.
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Wear glasses or contact lenses if you often wear them. If you are wearing bifocals, look through the part of the lens for near vision.
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Hold the grid at your normal reading distance (about 16 inches).
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Cover your left eye.
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With your right eye, look at the dot in the middle of the grid. You should still be able to see all 4 corners of the grid.
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While looking at the dot, notice if:
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Keep a log with the dates you used the grid. Write down any vision changes from the last time you used it.
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Now do this again. This time, cover your right eye.
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Call your healthcare provider right away if you notice any vision changes.