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Related Concept Videos

Learning Disabilities01:25

Learning Disabilities

Learning disabilities are cognitive disorders caused by neurological impairments that affect cognitive functions like language and reading, without indicating overall intellectual or developmental challenges. These disabilities differ from global intellectual or developmental disabilities as they are limited to distinct cognitive functions. Common learning disabilities include dysgraphia, dyslexia, and dyscalculia, each of which impacts unique aspects of learning.
Dyslexia
Dyslexia is a...
Language and Cognition01:27

Language and Cognition

Language serves as a bridge between ideas and communication, influencing how individuals perceive and interact with the world. Psychologists have long debated whether language shapes thought or vice versa. This discussion gained grip with Edward Sapir and Benjamin Lee Whorf in the 1940s, who proposed that language determines thought, a concept known as linguistic determinism. They suggested that the vocabulary and structure of a language influence how its speakers think and perceive reality.
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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, whereas...
Vision01:24

Vision

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.
Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

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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Related Experiment Video

Updated: Jun 4, 2026

Advancing Dyslexia Assessment in Children Through Computerized Testing
09:00

Advancing Dyslexia Assessment in Children Through Computerized Testing

Published on: August 16, 2024

Learning disabilities, dyslexia, and vision.

Sheryl M Handler, Walter M Fierson, Section on Ophthalmology

    Pediatrics
    |March 2, 2011
    PubMed
    Summary

    Learning disabilities, including dyslexia, stem from brain-based language processing issues, not vision problems. Effective treatment requires evidence-based language and reading interventions, not unproven vision therapies.

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    12:55

    Multimodal Protocol for Assessing Metacognition and Self-Regulation in Adults with Learning Difficulties

    Published on: September 27, 2020

    Area of Science:

    • Neuroscience
    • Developmental Psychology
    • Educational Psychology

    Background:

    • Learning disabilities are diverse neurodevelopmental disorders impacting information processing, with dyslexia being the most common.
    • These conditions often stem from multifactorial etiologies, including genetic influences and brain system dysfunction.
    • Dyslexia is characterized by difficulties in decoding, word recognition, and reading comprehension, typically due to phonological deficits.

    Purpose of the Study:

    • To clarify the nature of learning disabilities and dyslexia.
    • To differentiate between evidence-based and scientifically unsupported treatments.
    • To emphasize the importance of early recognition and appropriate interventions.

    Main Methods:

    • Review of scientific literature on learning disabilities and dyslexia.
    • Analysis of research supporting language-based versus vision-based interventions.
    • Evaluation of evidence for various diagnostic and treatment procedures.

    Main Results:

    • Learning disabilities, including dyslexia, are language-based disorders originating from phonological deficits.
    • Scientific evidence does not support the claim that vision problems cause or exacerbate learning disabilities.
    • Numerous vision-based therapies lack scientific validation for treating learning disabilities.

    Conclusions:

    • Early identification and evidence-based, language-focused interventions are crucial for successful outcomes in children with learning disabilities.
    • Remedial programs should concentrate on explicit instruction in phonemic awareness, phonics, decoding, fluency, vocabulary, and comprehension.
    • Vision therapy and other unproven visual interventions are not effective treatments for learning disabilities.