astigmatism,distortion

what is astigmatism?
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air optix astigmatism隐形眼镜 alcon airoptix astigmatism 散光
博士伦 bausch & lomb ultra for astigmatism 散光月抛 度数范围
air optix for astigmatism 舒视氧散光高透氧隐形眼镜