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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.

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...

Depth Perception and Spatial Vision

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.

Motor and Sensory Areas of the Cortex

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.

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,...

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: Jun 8, 2026

Visualizing Visual Adaptation

Visualizing Visual Adaptation

Published on: April 24, 2017

Cortical adaptation and visual enhancement.

Zeev Zalevsky¹, Shai Ben Yaish, Alex Zlotnik

¹School of Engineering, Bar-Ilan University, 52900 Ramat-Gan, Israel. zalevsz@macs.biu.ac.il

|September 18, 2010

Summary

New extended depth of focus technology corrects all refractive errors simultaneously in eyeglasses and contact lenses by utilizing the visual system's adaptive capabilities. This innovation offers a comprehensive solution for vision correction.

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Area of Science:

Ophthalmology and Vision Science
Optics and Photonics

Background:

Traditional ophthalmic devices correct specific refractive errors but do not leverage neural adaptation.
Existing technologies lack the ability to address multiple refractive conditions concurrently.

Purpose of the Study:

To introduce and test an extended depth of focus (EDOF) technology integrated into conventional refractive devices.
To evaluate the potential of EDOF technology to correct a wide spectrum of refractive errors.

Main Methods:

Implementation of EDOF technology in spectacles and contact lenses.
Testing the efficacy of the EDOF technology in correcting refractive errors.
Exploiting visual system's contrast adaptation and visual field coherence capabilities.

Main Results:

The EDOF technology successfully corrects myopia, hyperopia, presbyopia, and astigmatism (regular/irregular) simultaneously.
The technology addresses combined refractive errors effectively.
Successful integration of EDOF into standard ophthalmic devices.

Conclusions:

The developed EDOF technology offers a unified solution for all refractive errors.
This innovation capitalizes on the visual system's inherent adaptive mechanisms.
Potential for a new generation of ophthalmic devices with broad refractive correction capabilities.