相关实验视频
Updated: Jun 29, 2025

05:36
Subjective Refraction Test Using a Smartphone for Vision Screening
Published on: October 18, 2024
670
对 κ 和 α 角与儿童的折射和前段参数的相关性分析
Yuhao Ye1,2,3,4, Yu Zhao1,2,3,4, Zhe Zhang1,2,3,4
1Department of Ophthalmology and Optometry, Eye and ENT Hospital of Fudan University, Shanghai, China.
BMC ophthalmology
|March 29, 2024
概括
这项研究发现,儿童的α角和kappa角与角膜曲率半径和白至白的距离相关. 较大的白色到白色距离可能表明,与另一只眼相比,一只眼睛的角卡帕较小.
科学领域:
- 眼科医生 眼科 眼科
- 儿科眼科医生 儿科眼科医生
- 眼睛的生物识别技术
背景情况:
- 了解眼部生物识别参数对于儿科眼科护理至关重要.
- 角度alpha和kappa是眼睛对齐和光学属性的重要指标.
- 关于这些角度与儿童其他生物识别参数的相关性,研究有限.
研究的目的:
- 调查α角 (α) 和kappa角 (κ) 与儿童的折射和生物参数之间的相关性.
- 分析角膜曲率半径 (CR) 和白至白距离 (WTW) 如何影响这些角度.
主要方法:
- 一个涉及438只眼睛的219名儿童 (3-15岁) 的案例系列研究.
- 使用IOL Master 700测量眼部生物量 (轴长,CR,WTW,α和 κ角).
- 在循环下评估自折射;眼睛按CR,WTW和性别分组进行比较分析.
主要成果:
- 角度α与CR (FEC=0.237,p=0.015) 和WTW (FEC=-0.109,p=0.003) 相对应.
- 角 κ 与 CR (FEC=0.271,p=0.003) 和 WTW (FEC=-0.147,p<0.001) 相对应.
- 眼睛具有大的CR和小WTW显示显著更大的角度α和 κ. 眼间角度α和 κ的差异与整眼WTW相关.
结论:
- 在儿童中,α/κ角的大小可能与角膜曲率半径和白至白的距离相关.
- 与同眼相比,较大的白至白距离可能与较小的 κ 角度有关.
相关概念视频
Focusing of Light in the Eye
2.7K
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...
2.7K
Properties of Enantiomers and Optical Activity
17.0K
It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
17.0K
Design Example: Traverse Angle Computations
79
Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...
79
Unsymmetric Bending - Angle of Neutral Axis
303
Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
303

