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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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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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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

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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
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多段眼镜镜片用于近视控制. 第1部分:光学

Hema Radhakrishnan1, Carly Siu Yin Lam2,3, W Neil Charman1

  • 1Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)
|June 28, 2023
PubMed
概括

我们分析了为控制近视而设计的Hoya MiyoSmart和Essilor Stellest眼镜镜片的光学. 两种多焦镜头都在视网膜成像上表现出类似的效果,尽管存在轻微的制造差异.

关键词:
这就是MiyoSmart.这是最好的,最好的,最好的.多个细分的多个细分.短视近视近视近视近视近视近视近视近控制近视,控制近视.

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科学领域:

  • 眼科医生 眼科 眼科
  • 光学是什么?光学是什么?光学是什么?
  • 生物医学工程 生物医学工程

背景情况:

  • 近视的进展是儿童日益关注的问题.
  • 多段镜片 (MS) 是一种控制近视的新方法.
  • 了解这些镜片的光学特性对于它们的有效性至关重要.

研究的目的:

  • 为了比较两个MS眼镜镜片的光学特性:Hoya MiyoSmart和Essilor Stellest.
  • 分析这些镜头如何影响眼睛的光学和视网膜图像.

主要方法:

  • 使用表面成像,Twyman-Green干扰计和焦点计进行光学评估.
  • 测量载体镜片功率和镜片片的特征 (空间分布,功率,形状).
  • 几何光学计算来预测对眼光学的影响.

主要成果:

  • 制造的MS镜头通常与设计规格相匹配,但存在微小的差异.
  • 镜头的功率大约为 +3.50 D (MiyoSmart) 和 +4.00 D (Stellest). 镜头的功率大约是 +3.50 D (MiyoSmart) 和 +4.00 D (Stellest). 镜头的功率大约是 +3.50 D (MiyoSmart) 和 +4.00 D (Stellest).
  • 这两种镜头类型都降低了图像对比度,并创建了多个位移图像,效果因瞳孔大小和镜片的配置而异.

结论:

  • 霍亚MiyoSmart和Essilor Stellest眼镜镜头在视网膜图像上表现出大致相同的效果.
  • 这些近视控制镜片的光学性能是一致的,尽管设计变化.