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相关概念视频

Color Vision01:24

Color Vision

547
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.
547

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相关实验视频

Updated: Jun 17, 2025

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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模式逆转视觉唤起了假肢视觉和模拟视觉减弱的潜力.

Yingchen He1, Jonathon Toft-Nielsen2,3, Gordon Legge4

  • 1Department of Psychology, North Carolina State University, Raleigh, North Carolina, USA yhe29@ncsu.edu.

BMJ open ophthalmology
|August 5, 2024
PubMed
概括

在Argus II视网膜假肢使用者的视觉唤起潜力 (VEP) 显示出与有视力的个体相似的模式. 这种客观方法有助于评估植入体使用者的人工视觉治疗系统 (AVTS).

关键词:
电子生理学 电子生理学假肢 假肢是一种假肢.视觉路径 视觉路径视觉感知 视觉感知 视觉感知

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Simultaneous Recording of Electroretinography and Visual Evoked Potentials in Anesthetized Rats
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科学领域:

  • 神经科学是一个神经科学.
  • 眼科医生 眼科 眼科
  • 生物医学工程 生物医学工程

背景情况:

  • 假肢视力旨在使用人工视力治疗系统 (AVTS) 恢复视力.
  • 评估这些系统的有效性需要对视觉处理的客观测量.
  • 视觉唤起潜能 (VEP) 提供了一种非侵入性方法来评估视觉通路功能.

研究的目的:

  • 在使用Argus II视网膜假肢的患者中量化评估视觉唤起潜力 (VEP).
  • 为了比较假肢视力中的VEPs与视力控制中的模拟视力减弱.
  • 为了确定早期视觉皮层对来自假肢的视网膜输入的响应能力.

主要方法:

  • 从使用Argus II视网膜假肢的四名盲人患者和七名视力控制人群中记录了VEP.
  • 使用模式逆转刺激,患者和对照人群呈现率不同.
  • 控制对象经历了模拟的视觉减少 (模糊,对比度减少,场限制).

主要成果:

  • 阿格斯II患者的VEP表现出类似于正常VEP的波形形状.
  • 对照组的模拟视觉减少表明,模糊延迟了P100峰值时间,而减少对比度则降低了P100振幅.
  • 场限制没有显著影响P100的振幅或延迟.

结论:

  • 早期视觉皮层仍然对视网膜假体使用者的视网膜输入有反应.
  • 模式逆转的VEP为评估AVTS提供客观见解,并指导用户选择,安装和培训.
  • 解释VEP结果需要考虑电极刺激时间和位置的不确定性.