具有相同设计和材料的单焦和衍射多焦托里克眼内透镜的旋转稳定性:基于倾向分数的前性比较研究
Runhan Shi1,2,3,4, Dongmei Ma1,2,3, Qiulin Zeng5
1Department of Ophthalmology, Eye, Ear, Nose, and Throat Hospital, Fudan University, 83 Fenyang Rd, Shanghai, 200031, China.
BMC ophthalmology
|February 16, 2024
概括
衍射型多焦点眼镜 (IOL) 显示出比单焦点眼镜更好的旋转稳定性,特别是在特定的患者子组中. 这两种内腔镜类型在手术后的前24小时内经历了最多的旋转.
科学领域:
- 眼科医生 眼科 眼科
- 生物医学工程 生物医学工程
- 材料科学 材料科学 材料科学
背景情况:
- 在白内障手术期间,托里克眼内透镜 (IOL) 可以纠正白内障手术期间的.
- 旋转稳定性对于保持托里克内膜眼镜的疗效至关重要.
- 单焦和多焦的托里克眼镜提供不同的视觉效果,但需要相似的稳定性.
研究的目的:
- 为了比较单聚焦的托里克IOL和具有相同设计和材料的衍射多聚焦的托里克IOL的旋转稳定性.
- 评估随着时间的推移内视镜的旋转,并确定影响稳定性的因素.
主要方法:
- 一项前性研究,涉及患者植入了板状触角体内膜眼镜.
- 倾向性得分匹配 (PSM) 用于平衡患者基线特征.
- 在多个术后时间点 (1小时至3个月) 测量IOL旋转,使用线性混合模型进行重复测量.
主要成果:
- 在PSM之后,每个组分析了126只眼睛.
- 对两种类型来说,术后1小时至1天之间发生了最大的内腔镜轮换.
- 在2周 (P=0.015) 后,与多焦焦焦焦 IOL (3.53° ± 3.54°) 相比,单焦焦焦 IOL 的旋转明显更大 (5.40° ± 7.77°).
- 在具有透镜厚度 (LT) ≥4.5毫米和白至白距离 (WTW) ≥11.6毫米的子组中,观察到单焦 toric IOL的更大旋转.
结论:
- 与单焦焦焦 IOL 相比,衍射式多焦焦焦 IOL 提供了优越的旋转稳定性.
- 这种改善的稳定性在患有更厚的透镜 (LT ≥4.5毫米) 和更宽的角膜直径 (WTW ≥11.6毫米) 的患者中尤其显著.
- 这两种内腔眼镜类型的旋转模式是相似的,峰值旋转发生在术后早期.
相关概念视频
01:16Focusing of Light in the Eye
2.8K
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...
2.8K
01:11Rotation of Asymmetric Top
893
By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
893
01:14Stability of structures
165
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
165
02:52Stereoisomerism
11.9K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.9K