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Astigmatism?
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I've just found out that I have an astigmatism in my left eye (cylinder -0.50 axis 170.0 if that means anything to anyone). I know that it means an irregular curvature of the eye but what does it mean on a practical level? Does it affect my eyesight or just how my glasses are made? Does anyone know whether, from the above measurements, how severe mine is?
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For more on marking an answer as the "Best Answer", please visit our FAQ.You'll have nothing to worry about. See Ethel for the astigmatism levels. The -0.50 is the level of power in your lens. I used to make them! Plano (plane glass) has a zero power, next strength is 0.25, 0.50, 0.75 etc, and they usually go up to 20.00, so you've a very weak prescription. Lenses can be + or -, depending on what your eyesight is like (If you're near or far-sighted). + simply magnifies things, - makes things look smaller.