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Hi. I can answer that for you.
Single vision full time wear would have your distance Rx only. No plus add (bifocals, either with or without a line). They would give you your best distance vision and do nothing to help with reading vision.
Single vision, reading only would not have any distance Rx in it all. They would not help you to see in the distance, as a matter of fact, they would make distant objects very blurry. This type of glasses would only be used for reading and other near vision tasks. They would be much the same as "dime store cheaters" you use for reading, except in a much better frame.
I hope this has answered your question.
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