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Photoreceptors and Visual Pathways01:22

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Glaucoma: Overview01:25

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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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相关实验视频

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A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
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跑步机上行走会损害早期玻璃眼的视觉功能,老年人控制.

Rosalie Beyer1, Khaldoon O Al-Nosairy1, Constantin Freitag2

  • 1Ophthalmic Department, University Hospitals Magdeburg, Leipziger Str. 44, 39120, Magdeburg, Germany.

Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie
|June 10, 2024
PubMed
概括
此摘要是机器生成的。

跑步机上行走会影响视觉功能,如视觉敏度和视野平均偏差在健康的老年人和患有青光眼的人群中. 这项研究引入了一种新方法来评估行走期间的视力变化,这对于了解跌倒风险至关重要.

关键词:
对比度灵敏度 对比度灵敏度眼光障碍 眼光障碍 眼光障碍 眼光障碍流动性 流动性 流动性视力敏度 视力敏度 视力敏度视觉场 视觉场 视觉场 视觉场

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Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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科学领域:

  • 眼科和老年医疗医学
  • 研究老年人群中视觉功能和移动性之间的相互作用.

背景情况:

  • 视力受损是老年人倒的重要危险因素.
  • 视力功能障碍的常见原因之一眼,可加剧跌倒的风险.
  • 了解行走过程中视觉功能如何受到影响,对于预防跌倒的策略至关重要.

研究的目的:

  • 测试跑步机 (TM) 步行对健康的老年人和患有青光眼的人的视觉功能产生影响的假设.
  • 引入和验证一种用于在行走时评估视觉功能的新范式.
  • 探索老年人视力障碍,移动性和跌倒风险之间的关系.

主要方法:

  • 一项涉及30名健康对照组 (HC) 和18名年龄在62-83岁之间的青光眼患者 (GLA) 的横截面研究.
  • 双眼评估的视觉功能:最佳校正的视敏度 (BCVA) 有/没有拥挤,对比度敏感度 (CS) 和视野平均偏差 (VF-MD).
  • 在站立和TM行走期间以首选的快速速度和固定3.5公里/小时进行的测试.

主要成果:

  • 早期中度视野损失的青光眼患者的表现与健康对照人群相比相当.
  • 无论组别如何,步行速度都对BCVA (平均损失0.02-0.05 logMAR) 和VF-MD (平均损失1dB) 产生了显著的影响.
  • 对比度灵敏度 (CS) 没有受到步行速度的显著影响.

结论:

  • 成功开发和验证了一种用于评估行走期间视觉功能的新方法.
  • 跑步机上行走诱导BCVA和VF-MD的可测量下降,无论是健康的老年人还是青光眼患者.
  • 这种方法对调查视力障碍,移动性和在格洛科马等疾病中增加跌倒频率之间的联系充满希望.