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Kalle Erikssons optiker säger att Kalle drabbats av presbyopi. Kalle som är 48 år har i sin hand ett optikerrecept där hans refraktion står angiven. Det står:Hö: +3.25 - 0.75/90; Vä: + 3.00 - 0.50/105.a) Vilken styrka på glas för läsning tycker du skulle vara lämpligt för Kalle? (1p)b) Om Kalle istället hade varit närsynt med följande refraktion (Hö: -1.25 - 0.75/90; Vä: -1.50 - 0.50/105), vad hade hans lämpliga styrka för läsning varit då? (1p)

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