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Related Concept Videos

Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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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.
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Vision01:24

Vision

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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.
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Focusing of Light in the Eye01:16

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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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Visual System01:26

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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.
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Parallel Processing01:20

Parallel Processing

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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Anatomy of the Eyeball01:20

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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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Related Experiment Video

Updated: Mar 31, 2026

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Perceptual learning improves neural processing in myopic vision.

Fang-Fang Yan, Jiawei Zhou, Wuxiao Zhao

    Journal of Vision
    |October 27, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Perceptual learning can enhance vision in individuals with myopia by improving neural processing. This non-invasive training shows lasting benefits for visual acuity and contrast sensitivity.

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    Area of Science:

    • Vision science
    • Neuroscience
    • Ophthalmology

    Background:

    • Visual performance depends on both optical quality and neural processing.
    • The potential for neural compensation of optical defects via perceptual learning remains an open question.

    Purpose of the Study:

    • To investigate if perceptual learning can compensate for optical defects in myopic vision.
    • To assess the impact of targeted training on visual functions in individuals with myopia.

    Main Methods:

    • A perceptual learning study involving 23 observers with myopic vision.
    • Monocular grating detection training targeting high-frequency deficits near individual cutoff spatial frequencies.
    • Assessment of contrast sensitivity function, visual acuity, and threshold versus external noise contrast function before and after training.

    Main Results:

    • Significant improvements in contrast sensitivity and visual acuity were observed in both eyes after training.
    • Training-induced enhancements were retained for at least four months.
    • Mechanisms of improvement included reduced internal additive noise and enhanced external noise exclusion.

    Conclusions:

    • Perceptual learning offers a potential non-invasive method to compensate for optical defects in mild to moderate myopia.
    • Neural plasticity plays a significant role in adapting visual performance to optical challenges.