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首页> 外文期刊>PLoS One >Change in the geometry of positive- and negative-powered soft contact lenses during wear
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Change in the geometry of positive- and negative-powered soft contact lenses during wear

机译：磨损期间正面和负电动隐形眼镜的几何形状的变化

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Contact lens wear causes mutual interactions between the ocular surface and the lens, which may affect comfort as well as vision. The aim of this study was to examine deformations in modern positive- and negative-powered silicone hydrogel soft contact lenses (SiH SCLs) after 7 days of continuous wear. This pre-post interventional study included 64 eyes: 42 eyes with myopia of -3.00 D and 22 eyes with hyperopia of +3.00 D. All patients underwent general ophthalmic examination, corneal topography/tomography, total corneal and epithelial thickness mapping, and specular microscopy before and after the wearing period. SiH SCLs made of senofilcon A were worn continuously for 7 days on all eligible eyes. The geometry of the new and used lenses was measured 3 to 6 minutes after removal in two perpendicular planes using a custom-made swept source optical coherence tomography (SS-OCT) system for in vitro measurements. The anterior and posterior radii of curvature decreased in -3.00 D lenses in two perpendicular planes. This effect correlated significantly with average keratometry of the cornea. Sagittal lens height was lower in +3.00 D lens after wear, which correlated moderately with the corneal sagittal height. A significant decrease in central corneal epithelial thickness was observed after wearing +3.0 D lenses. In conclusion, SiH SCLs made of senofilcon A undergo minor deformations after 7-day continuous wear. Geometry modifications are different for -3.00 D and +3.00 D lenses, and they imitate the shape of the anterior eye surface. These geometric changes are accompanied by a decrease in the central thickness of corneal epithelium after +3.00 D lens wear.
机译：隐形眼镜磨损导致眼表面和镜头之间的相互相互作用，这可能影响舒适性以及视觉。本研究的目的是在连续磨损的7天后检查现代正面和负动力硅胶软胶软隐形眼镜（SIH SCL）中的变形。这种前介入的研究包括64只眼睛：42只眼睛与-3.00d的近视和22只眼睛+ 3.00天的远程+ 3.00天。所有患者都经过一般眼科检查，角膜地形/断层扫描，总角膜和上皮厚度映射，以及镜面显微镜佩戴期之前和之后。 SIH SCL由Senofilcon A制成的持续持续7天，所有符合条件的眼睛。使用定制的扫描源光学相干断层扫描（SS-OCT）系统在两个垂直的平面中除去3至6分钟，测量新的和二手镜片的几何形状。两个垂直平面中的曲率的前半径和后半径下降到-3.00 d透镜。这种效果显着与角膜的平均静脉测量相关。穿着后，矢状镜头高度较低，耐磨后均为肌晶片，与角膜矢状高度适度。佩戴+ 3.0 D晶体后，观察到中央角膜上皮厚度显着降低。总之，SIH SCLS由Senofilcon A经过7天连续磨损后经过轻微变形。几何修改对于-3.00d和+3.00 d透镜不同，它们模仿前眼表面的形状。这些几何变化伴随着角膜上皮的中央厚度在+3.00d透镜磨损后的降低。

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