相关实验视频
Updated: Jul 26, 2025
05:36
Subjective Refraction Test Using a Smartphone for Vision Screening
Published on: October 18, 2024
867
通过一种新型的双通仪器测量中央和外围折射率
Dimitrios Christaras1,2, Spyridon Tsoukalas1,2, Petros Papadogiannis3
1Diestia Systems, 77-79 Platonos str., 14401, Athens, Greece.
Biomedical optics express
|June 21, 2023
概括
一个新的双通仪器准确地测量了眼睛的中心和外围折射力,没有循环. 这种经过验证的方法显示了与波纹传感器的良好相关性,特别是对于失焦测量.
科学领域:
- 眼科医生 眼科 眼科
- 光学工程是指光学工程.
- 视觉科学科学 视觉科学
背景情况:
- 精确测量眼镜折射对于视力纠正至关重要.
- 现有的方法可能需要循环,或者在评估外周折射时是有限的.
- 需要一个非侵入性的,全面的折射评估工具.
研究的目的:
- 提出和验证一款用于测量中心和外围折射的新型双通仪器.
- 评估仪器在健康受试者中的性能,使用体内,非cycloplegic测量.
- 为了将新型仪器的结果与标准的哈特曼-沙克波面传感器进行比较.
主要方法:
- 开发了一种使用红外激光,可调节镜头和CMOS摄像头的双通仪器.
- 获取眼睛的点分布函数 (PSF) 的 in-vivo,非cycloplegic,透过焦点图像.
- 分析图像以确定中心 (0°) 和外围 (30°) 视野中的失焦和白.
- 结果与实验室的哈特曼-沙克波纹传感器进行比较.
主要成果:
- 这种新型仪器成功获得了双通透,透过焦点的眼睛图像.
- 折射测量 (失焦和纹) 在中央和外围位置获得.
- 来自双通仪器的数据与哈特曼-沙克传感器的数据有很好的相关性.
- 相关性对于估计两种异常度的失焦是特别强烈的.
结论:
- 这种新型的双通仪器是一种经过验证的 in-vivo,非cycloplegic 眼镜折射的测量工具.
- 该仪器提供可靠的中心和外围折射数据,与已知的方法相比.
- 这项技术为全面的眼睛折射评估提供了一个有前途的方法.
相关概念视频
01:16Focusing of Light in the Eye
3.0K
Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
3.0K
01:25IR Spectrometers
1.2K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
1.2K
03:09Measuring Reaction Rates
25.4K
Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
25.4K