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膜透镜前面表面偏心对视觉敏度,对比度敏感度和眼眼的高阶偏差的影响

Aparna Badrinarayanan¹, Akshaya C Balakrishnan, Ronit Dutta

¹Department of Contact Lens, Sankara Nethralaya, Unit of Medical Research Foundation, Chennai, India.

Eye & contact lens

|June 5, 2023

概括

状镜片的前面表面异常度显著改善了形眼镜患者的视觉敏度和对比度灵敏度. 这些镜头还有效地减少了高阶偏差,提高了整体视觉性能.

科学领域:

眼科医生眼科眼科
视光学测量视光学测量视光学测量
生物医学工程生物医学工程

背景情况:

角膜是一种渐进的眼睛疾病,其特点是角膜变薄和膨胀.
膜透镜 (SLs) 是一种常见的治疗不规则的形因角引起的,通过创建光滑的折射表面来改善视力.
SLs的前面表面偏心率 (FSE) 可能会影响其光学性能,但其对形的视觉结果的具体影响尚未完全理解.

研究的目的:

为了研究变化前面表面异常度 (FSE) 的变形眼镜对纠正距离视敏度 (CDVA),对比度灵敏度 (CS) 和高阶偏差 (HOAs) 在患有角膜的患者的影响.
为了确定特定的FSE值是否提供优异的视觉校正,与其他患者群体相比.

主要方法:

一项涉及15只眼睛的研究,这些眼睛是用BostonSight SCLERAL镜头安装的角质患者.
使用了三种不同的FSE值 (0,0.30和0.60) 的镜头.
在基线和30分钟镜头磨损后,使用标准化图表和iTrace异常计进行了CDVA,CS和HOA的测量.

主要成果:

与基线测量相比,所有测试的FSE值显著改善了CDVA和CS.
在所有FSE值中,观察到与膜透镜磨损的HOA显著减少.
虽然FSE1 (0.30) 与FSE0 (0),相比,显示出更好地减少RMS昏迷和球形偏差的趋势,但在不同异常度之间没有发现整体视觉敏度或对比敏感度的显著差异.

结论:

波士顿Sight SCLERAL镜头,无论测试的前面表面异常度如何,都能有效地纠正高阶偏差,并增强角患者的视觉敏度和对比度灵敏度.
这些发现表明,从业者可以利用状透镜的可调 FSE 功能来优化单个角膜患者的视觉表现.
进一步的研究可能会探索长期影响和最佳的FSE选择,用于不同阶段的角质.

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