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Vision

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.

Anatomy of the Eyeball

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...

Color Vision

Color Vision

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.

Visual System

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...

Photoreceptors and Visual Pathways

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,...

The Retina

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.

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Related Experiment Video

Updated: Dec 10, 2025

Author Spotlight: Exploring the Link Between Time Perception of Visual Stimuli and Reading Skills

Author Spotlight: Exploring the Link Between Time Perception of Visual Stimuli and Reading Skills

Published on: January 19, 2024

Event timing in human vision: Modulating factors and independent functions.

Valtteri Arstila^1,2, Alexandra L Georgescu³, Henri Pesonen⁴

¹Department of Philosophy, University of Turku, Turku, Finland.

|August 28, 2020

Summary

Human event timing perception, including judgments of simultaneity (SJ) and temporal order (TOJ), is influenced by various individual and contextual factors. These factors selectively modulate timing functions, suggesting SJ and TOJ are partially independent processes.

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VisualEyes: A Modular Software System for Oculomotor Experimentation

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Published on: March 25, 2011

Area of Science:

Cognitive Psychology
Neuroscience
Human Perception

Background:

Accurate perception of temporal events is crucial for environmental interaction.
Judgments of Simultaneity (SJ) and Temporal Order (TOJ) are key paradigms for studying event timing.
The relationship and potential shared mechanisms between SJ and TOJ remain unclear.

Purpose of the Study:

To investigate whether SJ and TOJ rely on the same underlying mechanisms.
To determine if fixed thresholds exist for temporal resolution.
To examine how individual, temporal, and spatial factors modulate SJ and TOJ performance.

Main Methods:

Employed four visual event timing tasks: horizontal and vertical SJ and TOJ.
Analyzed binary responses using multilevel binary regression modeling.
Investigated modulatory effects of individual (sex, age), temporal (SOA, time of day), and spatial (stimulus orientation) factors.

Main Results:

Demonstrated that individual and contextual variables selectively modulate event timing functions.
Showed differential modulation of SJ and TOJ by various factors, explaining previous study variances.
Provided evidence for distinct influences on simultaneity and temporal order judgments.

Conclusions:

SJ and TOJ are not entirely dependent, as they are modulated differently by individual and contextual variables.
The findings highlight the complexity of human event timing perception.
Suggests distinct neural or cognitive processes underlie SJ and TOJ.