difference between spherical and cylindrical Lens in Hindi|cylindrical number|spherical number lens - YouTube
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Cylindrical power in eye means in hindi | cylindrical power kya hota hai | cylindrical lens - YouTube
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I have -6 Cylindrical & Spherical 0 in both eyes.Can I reduce my cyl. power to make -5 & increase Sph. in both eyes, is that combination is possible? - Quora
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Cylindrical lens is used to correct
