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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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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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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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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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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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相关实验视频

Updated: Jul 17, 2025

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
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由近视控制眼镜产生的视网膜阴影.

Martín de Tomas1, Abel Szeps2, Gabriel Martín3,4

  • 1International Optics and Ophthalmology, Buenos Aires, Argentina.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)
|August 29, 2023
PubMed
概括
此摘要是机器生成的。

视网膜OCT成像可视化了近视控制眼镜镜片 (DIMS,DEFOCUS,DOMS) 的外围阴影. 这种技术有助于理解和改善近视控制疗法,通过显示透镜诱导的失焦效应.

关键词:
图像 OCT 的图像.眼镜可以控制近视眼睛.视网膜的影子 视网膜的影子

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科学领域:

  • 眼科医生 眼科 眼科
  • 视光学测量 视光学测量 视光学测量
  • 生物医学光学 生物医学光学

背景情况:

  • 近视控制眼镜的目的是减缓近视的进展.
  • 了解这些镜片对视网膜的光学效应对于有效性至关重要.
  • 眼相干断层扫描 (OCT) 是用于视网膜可视化的非侵入性成像技术.

研究的目的:

  • 为了分析由失焦和扩散光学眼镜引起的视网膜阴影的眼球连贯性断层扫描 (OCT) 图像.
  • 评估通过特定的近视控制眼镜设计诱导的视网膜效应的可视化.

主要方法:

  • 一只眼睛配备了霍亚脱焦纳入多段 (DIMS),外围添加眼镜 (DEFOCUS) 和扩散光学多段 (DOMS) 镜头.
  • 红外线OCT捕获了黄斑区域的视网膜图像,具有中央固定.
  • 用光学生物计测量角膜功率和眼内距离.

主要成果:

  • DIMS和DOMS镜头产生了明显的外围视网膜阴影,使中央10-11°清晰.
  • DEFOCUS镜头导致视网膜外围区域变暗.
  • 放大分析表明,OCT光束的成像距离眼睛前部大约31毫米.

结论:

  • 视网膜OCT成像,具有设备特定的校正,可以可视化受影响的区域失焦或对比度减少从近视控制眼镜.
  • 这种可视化技术对于增强近视控制疗法具有潜在价值.
  • 海外提供了一种方法来评估新型眼镜镜片设计的现场光学影响.