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difference between spherical and cylindrical Lens in Hindi|cylindrical number|spherical number lens - YouTube
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Cylindrical lenses and its use in Eyeglasses (Hindi) || Astigmatism and its correction with Glasses - YouTube
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 lenses and its use in Eyeglasses (Hindi) || Astigmatism and its correction with Glasses - YouTube
Vision (eyesight): What does spherical, cylindrical, and axis mean in an eyeglass prescription? - Quora
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