下斜前置转移对垂直偏差的影响
Rui Li1,2, Shounan Qi1, Chenguang Wang3
1Department of Ophthalmology, The Second Hospital of Jilin University, Changchun, Jilin, China.
International ophthalmology
|January 29, 2025
概括
简化分级下斜前部转移 (IOAT) 有效地治疗垂直偏差和下斜肌过度活动 (IOOA). 这种手术技术显示出高的成功率和最小的并发症,如抗升高综合征 (AES).
科学领域:
- 眼科医生 眼科 眼科
- 眼 手术 整形外科
- 儿科眼科医生 儿科眼科医生
背景情况:
- 下斜肌过度运动 (IOOA) 和垂直偏差是的常见原因.
- 下斜前置转移 (IOAT) 是一种用于纠正这些情况的手术技术.
- 分级IOAT程序旨在根据偏差的严重程度优化结果.
研究的目的:
- 为了评估简化分级下斜前置转移 (IOAT) 程序的有效性和安全性.
- 用这种修改的IOAT技术来评估垂直偏差 (≥10 PD) 和IOOA的处理.
- 分析诸如抗升高综合征 (AES) 等并发症.
主要方法:
- 65名接受简化分级IOAT的患者的回顾性审查.
- 根据垂直偏差分组的患者:第一组 (≤20 PD),第二组 (>20 PD).
- 手术技术涉及下斜肌相对于下直肠插入的下斜肌的分级固定.
主要成果:
- IOAT成功地改善了垂直偏差,IOOA,异常的头部位置 (AHP),V模式和盘角 (FDA).
- 在两组患者中,超过99%的患者获得了垂直偏差的优秀或合理的结果.
- 在这两组中都没有报告抗升高综合征 (AES) 的病例.
结论:
- 简化分级IOAT程序有效地解决了IOOA,垂直偏差,DVD,AHP,V模式和FDA.
- 根据垂直偏差对程序进行分级,可以获得令人满意的结果.
- 修改后的技术,特别是对于偏差>20 PD,具有临床价值,并降低了AES风险.
相关概念视频
01:17Accessory Structures of the Eye
1.4K
Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
1.4K
01:21Deformations in a Transverse Cross Section
170
When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
170
01:18Transformation of Plane Stress
196
Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
196
01:12Transformation of Plane Strain
153
When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
153
01:16Stress on an Oblique Plane
504
Understanding stress on an oblique plane under axial loading is pivotal in material mechanics. This analysis offers insight into a material's durability and strength, which is crucial for civil engineering and structural design. Axial loading refers to force application along the material's central axis, causing compression or elongation and leading to normal stress. Normal stress occurs when a force acts perpendicularly to the material's area, resulting in compressive or tensile...
504
01:26Influence of Earth's Curvature and Atmospheric Refraction on Leveling
50
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
50