目的:这里,我们建议使用“KeraVio环”,这是一个便携式的,自拍为基础,基于Placido环视频内窥镜的智能手机连接的角膜地形图系统。这项研究的目的是评估和比较KeraVioRing和常规角膜断层扫描图像之间的角膜参数。
方法:我们将KeraVioRing设计为一种包含3D打印LED环的设备,用于生成可连接到智能手机的Placido环。两个LED环连接到一个锥形装置,两个角膜都被照亮了。在没有任何审查员帮助的情况下,使用连接到智能手机的KeraVio戒指进行自拍。通过智能软件分析角膜上捕获的Placido环,以计算角膜参数。正常的患者,圆锥角膜,或LASIK治疗的眼睛包括在内。还对每个受试者进行了前段光学相干断层扫描(AS-OCT)。
结果:我们发现最陡和最平坦的角膜曲率之间存在高度显著的相关性,角膜散光,以及使用KeraVio环和AS-OCT获得的矢量分量。在正常的受试者中,圆锥角膜,和LASIK治疗的眼睛,两种设备之间角膜散光的平均差异为-0.8±1.4屈光度(D)(95%的一致性界限(LoA),-3.6至2.0),-1.8±3.7D(95%LoA,-9.1至5.5),和-1.5±1.3D(95%LoA,-4.0至1.1),分别。
结论:实验结果表明,通过KeraVio环获得的角膜参数与通过AS-OCT获得的角膜参数相关。KeraVioRing具有通过提供用于便携式基于自拍的角膜地形图的工具来解决未满足的需求的潜力。
OBJECTIVE: Herein, we propose the use of the \"KeraVio Ring\", which is a portable, selfie-based, smartphone-attached corneal topography system that is based on the Placido ring videokeratoscope. The goal of this study was to evaluate and compare corneal parameters between KeraVio Ring and conventional corneal tomography images.
METHODS: We designed the KeraVio Ring as a device comprising 3D-printed LED rings for generating Placido rings that can be attached to a smartphone. Two LED rings are attached to a cone-shaped device, and both corneas are illuminated. Selfies were taken using the KeraVio Ring attached to the smartphone without assistance from any of the examiners. Captured Placido rings on the cornea were analysed by intelligent software to calculate corneal parameters. Patients with normal, keratoconus, or LASIK-treated eyes were included. Anterior segment optical coherence tomography (AS-OCT) was also performed for each subject.
RESULTS: We found highly significant correlations between the steepest and flattest keratometry, corneal astigmatism, and vector components obtained with the KeraVio Ring and AS-OCT. In subjects with normal, keratoconus, and LASIK-treated eyes, the mean difference in corneal astigmatism between the two devices was -0.8 ± 1.4 diopters (D) (95% limits of agreement (LoA), -3.6 to 2.0), -1.8 ± 3.7 D (95% LoA, -9.1 to 5.5), and -1.5 ± 1.3 D (95% LoA, -4.0 to 1.1), respectively.
CONCLUSIONS: The experimental results showed that the corneal parameters obtained by the KeraVio Ring were correlated with those obtained with AS-OCT. The KeraVio Ring has the potential to address an unmet need by providing a tool for portable selfie-based corneal topography.