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What is “ADD”, or “NV” (near vision) value on my prescription?

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What is “ADD”, or “NV” (near vision) value on my prescription?

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ADD, or NV is the reading part for a lens in a multi focal prescription. The positive “ADD”, or “NV” value is the same for both eyes, which is why sometimes it is written only once on a prescription. In simple terms it indicates the additional strength of the overlay on the lens for reading.

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