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相关概念视频

Focusing of Light in the Eye01:16

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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...
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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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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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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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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.
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相关实验视频

Updated: Jun 29, 2025

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

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在高海拔地区的高近视.

Ta-Wei Wang1, Ming-Kun Huang2,3,4, Chih-Chun Hsu5

  • 1Department of Emergency Medicine, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan, Taiwan.

Frontiers in physiology
|March 25, 2024
PubMed
概括
此摘要是机器生成的。

在中等高度的视神经外直径 (ONSD) 的变化可以预测徒步旅行者的急性山病 (AMS) 症状. 高近视可能会影响高海拔徒步旅行期间的眼睛反应.

关键词:
有关急性山病的疾病.在高海拔地区,高海拔地区.高近视高近视的情况.眼内压力 眼内压力视神经外直径的视神经外.

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科学领域:

  • 眼科医生 眼科 眼科
  • 高度生理学 高度生理学
  • 高海拔医学 高海拔医学

背景情况:

  • 视神经外直径 (ONSD) 在高海拔地区增加,与急性山病 (AMS) 相相关.
  • 高空暴露对眼内压力 (IOP) 有影响,但近视徒步旅行者的眼睛反应尚未得到充分研究.
  • 高近视 (HM) 可能会影响生理学适应的低性缺氧.

研究的目的:

  • 在高海拔徒步旅行期间,调查高近视 (HM) 和没有高近视 (HM) 的徒步旅行者在ONSD和IOP的变化.
  • 为了确定这些眼部变化是否可以预测AMS症状.
  • 探索HM对高度眼睛生理反应的影响.

主要方法:

  • 山的3天徒步旅行涉及9名HM参与者和18名没有HM参与者.
  • 在徒步旅行之前和期间测量ONSD和IOP.
  • 使用问卷评估AMS症状.

主要成果:

  • 在HM和非HM组中,ONSD显著增加,达到1,700m.
  • 在HM组中,内压力更高,为3,150m.
  • 在1700米处的分数ONSD变化与AMS发展 (r=0.448,p=0.019) 和头痛 (r=0.542,p=0.004) 相相关.
  • ROC分析显示,ONSD分数变化有效预测了AMS (AUC=0.859) 和头痛 (AUC=0.803).

结论:

  • 在中等高度的ONSD变化可以预测AMS症状.
  • 在高海拔地区,HM可能会影响眼部适应和水性水分调节.
  • 监测ONSD可能有助于预测和管理徒步旅行者中的AMS.