Physics · Light and Optics
प्रेसबायोपिया (जरा-दूरदृष्टिता) आमतौर पर वृद्धावस्था में होने वाला एक दृष्टि दोष है। इसे किसका उपयोग करके ठीक किया जाता है?
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द्विफोकसी (बायफोकल) लेंस
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