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Accessory Structures of the Eye

Accessory Structures of the Eye

Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...

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.

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Related Experiment Video

Updated: Apr 17, 2026

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

The unsteady eye: an information-processing stage, not a bug.

Michele Rucci¹, Jonathan D Victor²

¹Department of Psychological and Brain Sciences, Boston University, Boston, MA 02215, USA; Graduate Program in Neuroscience, Boston University, Boston, MA 02215, USA.

Trends in Neurosciences

|February 21, 2015

Summary

This summary is machine-generated.

The visual system

Keywords:

eye movements microsaccades neural encoding ocular drift retina vision

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Area of Science:

Neuroscience
Visual System
Spatial Representation

Background:

The traditional view posits that spatial information is encoded by neuron locations in visual maps.
This spatial encoding model has been the dominant theory in visual neuroscience.
However, recent evidence challenges this purely spatial perspective.

Purpose of the Study:

To investigate the role of fixational eye movements in spatial representation within the visual system.
To challenge the conventional understanding of spatial encoding in visual neuroscience.
To explore the spatiotemporal nature of visual information processing.

Main Methods:

Review of experimental findings on the functional role of fixational eye movements.
Analysis of evidence supporting a spatiotemporal model of visual representation.
Discussion of implications for current theories in visual neuroscience.

Main Results:

Evidence suggests that spatial representation, even for static images, is fundamentally spatiotemporal.
Fixational eye movements play a crucial role in this dynamic spatial encoding.
The purely spatial view of neural representation is incomplete.

Conclusions:

Spatial representation in the visual system is not solely based on neural location but involves dynamic, spatiotemporal processes.
Fixational eye movements are integral to how the brain processes and represents spatial information.
A revised understanding incorporating spatiotemporal dynamics is necessary for visual neuroscience.