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相关概念视频

Focusing of Light in the Eye01:16

Focusing of Light in the Eye

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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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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...
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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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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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Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

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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: Sep 11, 2025

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
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偏差控制,随着固定距离的变化而恶化,在基本类型的间歇性外热态中.

Ryota Takada1, Akemi Wakayama2, Fumi Tanabe2

  • 1Department of Ophthalmology, Kindai University Faculty of Medicine, 377-2 Ohnohigashi, Osaka-sayama, Osaka, 589-8511, Japan. taka_r@med.kindai.ac.jp.

BMC ophthalmology
|August 19, 2025
PubMed
概括
此摘要是机器生成的。

间歇性异位变异 (IXT) 中偏差控制通常在1米时恶化,而不仅仅是在临床终点时. 通过评估多个固定距离的控制,可以更清楚地了解患者的眼睛对齐稳定性.

关键词:
控制 控制 控制 控制 控制覆盖试验试验 覆盖试验固定距离 固定距离 固定距离间歇性的外热性.

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A Method to Quantify Visual Information Processing in Children Using Eye Tracking
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相关实验视频

Last Updated: Sep 11, 2025

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
07:06

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

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科学领域:

  • 眼科医生 眼科 眼科
  • 视觉科学 视觉科学 视觉科学
  • 斯特拉比斯姆研究研究

背景情况:

  • 临床评估间歇性外极变 (IXT) 中偏差控制通常使用固定近 (30厘米) 和远 (5-6米) 距离.
  • 这些标准评估可能无法完全捕捉患者眼睛对齐控制在这些点之间如何波动.

研究的目的:

  • 为了研究标准临床近距离和远距离测试点之间的多个固定距离的偏差控制的变化.
  • 确定控制恶化在基础IXT患者中最常见的特定距离.

主要方法:

  • 在Kindai大学医院接受基础IXT治疗的48名患者的回顾性评估.
  • 覆盖试验与折射校正评估眼睛位置在6固定距离 (30厘米,1米,2米,3米,4米,5米).
  • 库什纳的方法 (2019) 将控制分类为有利的 (优秀/好) 或不利的 (差/公平);控制恶化被通过距离分析.

主要成果:

  • 在48名患者中,38名患者 (79%) 具有良好的基线控制.
  • 在那些控制能力恶化的患者中,57%的患者在1米后表现出恶化,明显高于其他距离 (p < 0.01).
  • 控制器的恶化最常见于1米,其次是3米.

结论:

  • 固定距离显著影响基本IXT患者的偏差控制.
  • 控制最常见的是在1米的固定距离下恶化.
  • 评估各种中间距离的控制,可以更彻底地了解患者对齐稳定性的情况.