散光眼是屈光系统光学缺陷之一。为了提高视力和消除视疲劳，通常应用眼镜矫正，但在验光配镜时如果散光度数较高或散光轴是斜轴（轴不在垂直或水平位上）则用足柱镜矫正后往往会引起影像不正、看物变形的视觉干扰，戴镜者很不易接受。此时就不得不将散光度数减少或取消，... Astigmatism is one of the optical defects of the refractive system. In order to improve vision and eliminate visual fatigue, usually the use of glasses correction, but in the optometry when the degree of astigmatism or astigmatism axis is oblique axis (the axis is not vertical or horizontal position), the use of cylinder correction will often lead to the image Not correct, see distortion of the visual distraction, wearing glasses is not easy to accept. At this point had to reduce or cancel astigmatism, ...