The nurse should explain these results to the client as "you can read at a distance of 20 feet what a person with normal vision can read at 30 feet".
A Snellen chart is an eye chart that can be used to measure visual acuity.
When the Snellen chart shows 20/30, the nurse can interpret it as follows;
The patient can read at a distance of 20 feet what a person with normal vision can read at 30 feet.
Thus, the nurse should explain these results to the client as "you can read at a distance of 20 feet what a person with normal vision can read at 30 feet".
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