Hyperopia long - sightedness a long - sighted or hyperopic eye is shorter than normal 远视的主要成因是眼球长度比正常短或角膜的弧度不足。
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The excimer laser refractive surgical instrument can be used to correct myopia , hyperopia astigmatism diopter 摘要准分子激光眼科治疗机可以用来进行近视、远视、散光等屈光不正的矫正手术。
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Hyperopia , or farsightedness , occurs when the shape of the eye is too short . in this case , light rays are focused on a point behind the retina 当眼睛的形状是太短的，远视或者远视，发生。在这种情况下，光线集中于在视网膜之后的点。
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Corneal surfaces in eyes with regular astigmatism are thought to be toroidal surfaces . based on mathematical models for corneal surfaces before and after treatment , a corneal ablation model is given for such refractive errors as spherical myopia , compound myopic astigmatism , and simple myopic astigmatism . a similar corneal ablation model is also given for such refractive errors as hyperopia , compound hyperopic astigmatism , and simple hyperopic astigmatism 采用超环面( toroidalsurface )建立起规则散光下的角膜曲面模型方程;定量研究了手术光学区屈光不正两种通用的矫正模型,一种模型适用于单纯近视、复性近视散光、单纯近视散光的矫正,另一种模型适用于单纯远视、复性远视散光、单纯远视散光的矫正;另外,作为影响手术效果的重要因素,提出了一种用于光学区直径和过渡区宽度均可调节时过渡区角膜切削量的计算模型。
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The visx star star 4 combines the technologies of customvue wavescan aberrometer , activetrak 3 - d active eye tracking , iris registration , variable spot scanning and variable repetition rate to provide customized wavefront treatment . in the past , standard lasik corrects refractive errors , such as myopia , hyperopia and astigmatism which are so - called low order aberrations 威视visx star 4是结合前波前像差分析仪3d眼球主动追踪系统虹膜定位系统ir iris registration及智慧型超微光斑等技术去提供个人化激光矫视疗程。在过去，标准lasik可解决近视远视及散光等所谓低阶像差问题。
