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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...

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 layer, the vascular tunic,...

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, whereas...

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.

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.

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Related Experiment Video

Updated: Jun 4, 2026

Using Looming Visual Stimuli to Evaluate Mouse Vision

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

Development of human visual function.

Oliver Braddick¹, Janette Atkinson

¹Department of Experimental Psychology, University of Oxford, Oxford, United Kingdom. oliver.braddick@psy.ox.ac.uk

Vision Research

|March 2, 2011

Summary

This summary is machine-generated.

Advances in infant vision assessment reveal increasing cortical control over visual pathways, with ongoing research into integrative processing and clinical applications for predicting visual and cognitive outcomes.

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Last Updated: Jun 4, 2026

Using Looming Visual Stimuli to Evaluate Mouse Vision

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Published on: May 27, 2009

A Method to Quantify Visual Information Processing in Children Using Eye Tracking

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Published on: July 9, 2016

Area of Science:

Neuroscience
Developmental Psychology
Ophthalmology

Background:

Infant vision assessment evolved significantly by 1985 using behavioral and electrophysiological techniques.
This review covers 25 years of advancements in infant visual development and assessment.

Observation:

Infant visual cortical function studied via orientation, motion, and disparity selectivity.
Subcortical oculomotor mechanisms (fixation shifts, optokinetic nystagmus) show increasing cortical dominance.
Neonatal face processing presents a challenge to current models.

Findings:

Recent research explores integrative processing in extra-striate visual areas, including dorsal and ventral stream development.
Asynchronies in stream development may link to vulnerability in genetic and acquired disorders.
New clinical approaches integrate pediatric neurology and ophthalmology for early detection and outcome prediction.

Implications:

Early visual measures in high-risk infants can predict later visual and cognitive outcomes.
Studies on visual system plasticity after cataract and blinding disorders offer insights.
Future research directions include post-infancy development, advanced imaging, and infant visual ecology.