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कोई व्यक्ति ऊधर्वाधर तथा क्षैतिज धारियों कि कमीज पहने किसी दूसरे व्यक्ति को देखता है । वह क्षैतिज धरियो की तुलना में ऊधर्वाधर धरियो को अधिक स्पष्ट देख पाता है । ऐसा किस दृष्टि दोष के कारण होता है ? इस दृष्टि दोष का संशोधन कैसे किया जाता है ?

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यह दृष्टि अबिंदुकता (astigmation) है । इसमें कॉर्निया की आकृति गोलाकार नहीं रहती । इसे दूर करने के लिये बेलनाकार लेंस का उपयोग किया जाता है ।

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