A person with hyperopia has (near point) NP > 25 cm, and hence is unable to bring an object 25 cm away into sharp focus. A corrective lens can be used to correct hyperopia by imaging an object at distance D = 25 cm onto a virtual image at the patient's near point. From the thin lens formula, the required lens will have optical power P given by
The calculation can be further improved by taking into account the distance between the spectacle lens and the human eye
In our case
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