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Related Concept Videos

Visual System01:26

Visual System

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...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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 layer, the vascular tunic,...
The Retina01:32

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
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.
Channel Rhodopsins01:11

Channel Rhodopsins

Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...

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Related Experiment Video

Updated: Jun 12, 2026

Using Optical Coherence Tomography and Optokinetic Response As Structural and Functional Visual System Readouts in Mice and Rats
07:08

Using Optical Coherence Tomography and Optokinetic Response As Structural and Functional Visual System Readouts in Mice and Rats

Published on: January 10, 2019

Reading with the rod visual system.

A Chaparro, R S Young

    Applied Optics
    |June 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Visually normal individuals can read using only their rod visual system, even at near-threshold light levels. Reading speed increases with luminance, offering insights into visual impairments.

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    Using Looming Visual Stimuli to Evaluate Mouse Vision
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    Using Looming Visual Stimuli to Evaluate Mouse Vision

    Published on: June 13, 2019

    Related Experiment Videos

    Last Updated: Jun 12, 2026

    Using Optical Coherence Tomography and Optokinetic Response As Structural and Functional Visual System Readouts in Mice and Rats
    07:08

    Using Optical Coherence Tomography and Optokinetic Response As Structural and Functional Visual System Readouts in Mice and Rats

    Published on: January 10, 2019

    Using Looming Visual Stimuli to Evaluate Mouse Vision
    05:07

    Using Looming Visual Stimuli to Evaluate Mouse Vision

    Published on: June 13, 2019

    Area of Science:

    • Vision science
    • Ophthalmology
    • Visual perception

    Background:

    • The rod visual system is primarily responsible for vision in low light conditions.
    • Previous research has explored reading capabilities under various visual conditions.
    • Understanding the limits of scotopic reading is crucial for visual neuroscience.

    Purpose of the Study:

    • To investigate the reading capabilities of visually normal subjects using an isolated rod visual system.
    • To quantify the relationship between luminance and reading speed in scotopic conditions.
    • To explore the potential implications for understanding reading difficulties in specific patient populations.

    Main Methods:

    • Utilized the scanned text technique developed by Legge and colleagues.
    • Employed visually normal subjects.
    • Measured reading performance at luminances near absolute thresholds.

    Main Results:

    • Visually normal subjects demonstrated the ability to read text using only the rod visual system.
    • Reading occurred slowly at luminances near absolute thresholds.
    • Peak reading rates increased by approximately 40 words per minute for every tenfold increase in luminance.

    Conclusions:

    • Scotopic reading is possible in visually normal individuals, albeit at reduced speeds.
    • The findings suggest a quantifiable relationship between luminance and scotopic reading rate.
    • Studying scotopic reading performance may offer insights into reading impairments in patients with bilateral central scotoma.