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相关概念视频

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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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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相关实验视频

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维生素A和近视之间的关系:一个基于人口的研究.

Yeo Jin Lee1,2, Donghyun Jee1,3

  • 1Department of Ophthalmology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.

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较高的血液维生素A水平与成人近视的发病率降低有关. 这项研究发现,增加维生素A的摄入量可能有助于防止近视的发展,特别是在近视高的女性和男性中.

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Scleral Cross-linking Using Riboflavin and Ultraviolet-A Radiation for Prevention of Axial Myopia in a Rabbit Model
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科学领域:

  • 眼科医生 眼科 眼科
  • 营养科学 营养科学
  • 公共卫生 公共卫生

背景情况:

  • 近视,或近视,是一个日益增长的全球健康问题.
  • 维生素A在视觉和细胞过程中起着至关重要的作用.
  • 了解影响近视的营养因素对于预防策略至关重要.

研究的目的:

  • 为了研究血液中维生素A水平与韩国成年人 (≥20岁) 近视患病率之间的联系.
  • 探索维生素A和近视或高近视之间的潜在的性别特异关系.

主要方法:

  • 分析了15899名参与韩国国家健康和营养检查调查的数据.
  • 通过折射测试评估近视和高近视.
  • 测量血液中维生素A水平,分为四分位数,以及其他健康指标.

主要成果:

  • 经过调整后的分析显示,血液中较高的维生素A水平与近视患病率之间存在反向关系 (趋势P<0.001).
  • 在女性中,维生素A水平升高与近视的几率较低有关 (第二四分位数OR:0.48,第三四分位数OR:0.67).
  • 在男性中,较高的维生素A水平显著降低了高近视的几率 (第二,第三和第四季度分别显示OR为0.05,0.15和0.05).

结论:

  • 血液中较高的维生素A水平与韩国成年人近视患病率相反相关.
  • 维生素A的充足可以提供对近视的保护作用,特别是男性的高近视和女性的近视.
  • 对预防近视的维生素A补充剂的进一步研究是有必要的.