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Topographical Evaluation of the Decentration of Orthokeratology Lenses

机译：角膜塑形镜偏角的地形评估

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Purpose: To evaluate the amount of lens decentration and various factors affecting decentration after Orthokeratology lens wear and to observe the effect of decentration on the visual functions. Methods: Two kinds of Orthokeratology lenses were fitted to 270 eyes of 135 patients [initial mean refractive error: (-3.98±1.51 )D]. Humphery Instruments ATLAS 990 was used for the computer-assisted analysis of corneal topographical maps. The examination of corneal topography was performed on patients before and after 6 months of wearing Orthokeratology lenses. The amount of decentration of Orthokeratology lenses was measured by finding the distance between center of optic zone and the pupil center. The factors influencing the amount of decentration were analyzed, including the initial refraction error, astigmatism, keratometry values, corneal eccentricity, and the diameter of lens. Visual symptoms including monocular diplopia, glare around lights were recorded to evaluate the effects of decentration on visual functions. Results: The mean amount of decentration was (0.49±0.34) mm after one night's wear. The mean amount of decentration after 1 month, 3 months and 6 months was (0.57±0.41) mm, (0.55±0.48) mm and (0.59±0.39) mm, respectively. After one month, the amount of decentration was less than 0.50 mm in 51.1% eyes, 0.50～1.0 mm in 35.6% eyes and more than 1.00 mm in 13.3% eyes. The direction of decentration of more than 0.50 mm was mainly in the temporal quadrant (48.5%). Patients with greater initial astigmatism and smaller lenses showed greater decentration (P < 0.05). There was no statistically significant difference in decentration between the two groups with different corneal eccentricities and keratometry values (P > 0.05). The amount of decentration was greater in patients who complained of monocular diplopia and glare. Conclusions: The amount of decentration of Orthokeratology depends on the initial refractive error, astigmatism and the design of Orthokeratology lenses. Improvement in fitting technology and lens design can lead to reduced incidence of decentration and visual symptoms.
机译：目的：评估角膜塑形镜配戴后的镜片偏心量和影响偏心的各种因素，并观察偏心对视觉功能的影响。方法：将两种角膜塑形镜配戴到135例患者的270眼中[初始平均屈光不正：（-3.98±1.51）D]。 Humphery Instruments ATLAS 990用于计算机辅助分析角膜地形图。在佩戴角膜塑形镜六个月之前和之后对患者进行角膜地形图检查。角膜塑形镜的偏心量通过找到视区中心与瞳孔中心之间的距离来测量。分析了影响散光量的因素，包括初始屈光不正，像散，角膜曲率测定值，角膜偏心率和晶状体直径。记录包括单眼复视，视觉眩光在内的视觉症状，以评估注意力分散对视觉功能的影响。结果：一夜佩戴后平均偏心量为（0.49±0.34）mm。 1个月，3个月和6个月后的平均偏心量分别为（0.57±0.41）mm，（0.55±0.48）mm和（0.59±0.39）mm。 1个月后，偏心量在51.1％的眼中小于0.50 mm，在35.6％的眼中0.50〜1.0 mm，在13.3％的眼中大于1.00 mm。偏心率大于0.50 mm的方向主要在颞象限（48.5％）。初始散光较大且晶状体较小的患者表现出更大的散瞳（P <0.05）。两组角​​膜偏心率和角膜曲率测定值不同时，两组的偏心率差异无统计学意义（P> 0.05）。抱怨单眼复视和眩光的患者的下沉量更大。结论：角膜塑形镜的散光度数取决于初始屈光不正，散光和角膜塑形镜的设计。配合技术和镜片设计的改进可以减少偏心和视觉症状的发生。

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