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相关概念视频

Glaucoma: Overview01:25

Glaucoma: Overview

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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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Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

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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.
Drugs such as carbonic anhydrase inhibitors, α2- and...
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Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

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Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
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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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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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相关实验视频

Updated: Jul 24, 2025

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
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在初级开放角玻璃眼中中心视觉注意力.

Louis Béal, Clémentine Garric1, Jean-François Rouland

  • 1Univ Lille, CHU-Lille, Lille Neuroscience & Cognition, Inserm, UMR-S1172, Lille, France.

Optometry and vision science : official publication of the American Academy of Optometry
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PubMed
概括
此摘要是机器生成的。

主要的开角玻璃眼会减缓视觉注意力任务中的手动反应,尽管视觉检测仍然完好无损. 降低对比度敏感度和视野损失影响表现,突出了视力损失之外的认知影响.

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科学领域:

  • 眼科医生 眼科 眼科
  • 认知神经科学 认知神经科学
  • 视觉心理物理学 视觉心理物理学

背景情况:

  • 主要开角青光眼 (POAG) 是不可逆转失明的主要原因.
  • 包括视觉注意力在内的认知功能可能会受到格洛科马的影响,远远超过直接视野损失.
  • 了解这些认知影响对于全面的患者管理至关重要.

研究的目的:

  • 为了评估初级开角绿内障对视觉注意力系统的影响.
  • 为了比较青光眼患者的行为和眼运动策略与对照组.
  • 为了研究临床因素和青光眼的注意力缺陷之间的关系.

主要方法:

  • 包括20名POAG患者,18名年龄匹配对照组和20名年轻对照组.
  • 利用眼睛跟踪和手动响应任务来评估视觉注意力.
  • 参与者在5度视角内确定了分散注意力的目标,中央视觉灵敏度得到确认.

主要成果:

  • 与年龄相匹配的对照组相比,绿眼病患者的手动响应时间明显较慢.
  • 眼睛追踪显示,在视觉目标检测时间上,格洛科马和年龄匹配的对照组之间没有显著差异.
  • 与年轻对照组相比,眼患者和年龄匹配的对照组显示出更长的扫描路径长度和对分心器的固定持续时间.
  • 对比度敏感度受损与手动响应缓慢,扫描路径较长和对分心器的固定性增加相关.

结论:

  • 玻璃眼会损害视觉注意力任务中的手动响应时间,但视觉检测仍然有效.
  • 临床因素,如年龄,视野损失和对比度灵敏度显著预测性能.
  • 这些发现表明,青光眼会影响与注意力相关的认知过程,需要进一步调查.