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What I meant is her current L & R and -4.0 diopters. So I am thinking if +1.75 adjustment each for differential for close-up , is the +1.75 based on about 50cm reading distance (and future active focus practice distance for close-up) or it should be +2.00 if the close-up distance is shortened to say about 35-45 cm range given that they are kids, a distance of 50 cm may be too uncomfortable/awkward in writing or reading textbook.