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相关概念视频

Vision01:24

Vision

53.5K
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
53.5K
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

7.1K
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...
7.1K
Visual System01:26

Visual System

591
Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
591
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

6.1K
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,...
6.1K
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

678
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
678
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

2.9K
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

Updated: Jul 11, 2025

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
07:45

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Published on: July 21, 2020

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双眼融合障碍中的异常基本视觉处理功能.

Laura Benhaim-Sitbon1, Maria Lev1, Uri Polat2

  • 1School of Optometry and Vision Sciences, Faculty of Life Sciences, Bar-Ilan University, Ramat Gan, Israel.

Scientific reports
|November 7, 2023
PubMed
概括
此摘要是机器生成的。

患有异面症的个体,眼睛不对齐,具有更大的视觉感知场 (PF). 这影响了视觉拥挤,可能解释了阅读困难和视觉研究中的变化.

更多相关视频

Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
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Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients

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Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia
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相关实验视频

Last Updated: Jul 11, 2025

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
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Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients

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Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia
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Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia

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科学领域:

  • 眼科医生 眼科 眼科
  • 视觉神经科学是一种神经科学.
  • 感知科学 感知科学

背景情况:

  • 异眼症是一种常见的双眼视力障碍,导致潜眼错位.
  • 这种失调会对阅读和使用计算机等日常视觉任务产生负面影响,可能导致计算机视觉综合征 (CVS).
  • 视觉拥挤,一种影响阅读清晰度的现象,受到感知场 (PF) 的大小的影响.

研究的目的:

  • 通过横向掩盖实验,研究异构对感知场 (PF) 大小的影响.
  • 为了确定由于异构体的PF大小的变化如何影响foveal拥挤和拥挤区域.
  • 探索拥挤,侧面掩饰,PF大小和异构的程度之间的关系.

主要方法:

  • 进行了侧面掩盖实验,以测量双眼水平感知场 (PF) 大小.
  • 在各种字母间距上评估了形拥挤,以定义拥挤区域.
  • 记录了响应时间,以评估拥挤和不拥挤条件下的处理力度.

主要成果:

  • 异性恋的受试者表现出更大的双眼水平感知场 (PF).
  • 一个更强大的拥挤效应和一个扩展拥挤区域被观察到的人与heterophoria.
  • 缓慢的响应时间表明异性恋个体中字母识别的处理工作量增加.
  • 发现拥挤区,PF大小和异面体的数量之间存在显著的相关性.

结论:

  • 异构体中较大的感知场 (PF) 有助于增加视觉拥挤和扩展拥挤区域.
  • 异构症中的这些视觉处理变化可能解释阅读困难和视觉研究中的观察者间的变化.
  • 这些发现与眼和幼儿的观察结果一致,表明存在共同的视觉处理机制.