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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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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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Overview
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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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虹膜颜色与儿童的折射误差之间的关联

Mehrdad Ebrahimi1, Anneh Mohammad Gharravi2, Roqayeh Aliyari3

  • 1Student Research Committee, School of Medicine, Shahroud University of Medical Sciences, Shahroud, Iran.

Scientific reports
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概括

带珀色虹彩的孩子有明显更高的近视发展的机会. 这一发现表明对这些儿童进行更密切的监测,并保证对虹膜颜色和视力发育进行进一步的研究.

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科学领域:

  • 眼科医生 眼科 眼科
  • 儿科眼科医生 儿科眼科医生
  • 遗传学 是一个遗传学.

背景情况:

  • 像近视和远视这样的折射误差是儿童的重大全球健康问题.
  • 虹膜颜色,一种受遗传影响的特征,已经被事地与视力状况联系在一起,但有力的证据有限.
  • 了解潜在的关联可以帮助儿童视力障碍的早期检测和干预策略.

研究的目的:

  • 调查各种虹膜颜色与6-12岁儿童近视和超视的患病率之间的关联.
  • 为了确定特定的虹膜颜色表型,可能与折射误差的风险增加相关.
  • 提供数据,可以为有风险的儿童提供有针对性的查计划.

主要方法:

  • 这是一项横截面研究,利用了Shahroud学校儿童眼睛队列研究的数据.
  • 虹膜颜色是使用标准化的近距离图像进行分类的.
  • 近视和远视被定义基于循环折射球体等效 (SE) 值.
  • 采用多种后勤回归模型,调整相关的共变量,如年龄,性别,居住地和视觉活动.

主要成果:

  • 这项研究包括5394名儿童,平均年龄为9.7岁;近视的患病率为4.8%,近视的患病率为4.7%.
  • 珀色虹膜颜色与深棕色虹膜相比,与更高的近视几率 (几率比率=4.8,95% CI:1.2-18.7) 有统计学显著的关联.
  • 虹膜颜色和视障之间没有发现显著的关联.

结论:

  • 珀色的虹膜颜色是与儿童近视的可能性增加相关的潜在危险因素.
  • 患有珀色虹膜的儿童可以从更密切的眼科监测和定期的眼科检查中受益.
  • 建议对不同种群和虹膜颜色进行更大样本大小的进一步研究,以确认这些发现.