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Related Concept Videos

Vision01:24

Vision

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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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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.
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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,...
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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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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: Dec 21, 2025

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
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A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

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Redefining vision assessment.

Colin E Brown1, George O Waring2, Karolinne M Rocha1

  • 1Storm Eye Institute, Medical University of South Carolina, Charleston.

Current Opinion in Ophthalmology
|May 14, 2020
PubMed
Summary
This summary is machine-generated.

Advanced ophthalmic diagnostic systems offer objective visual system evaluation beyond traditional methods. Technologies like wavefront analysis provide deeper insights into visual potential and irregularities.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Traditional vision assessment relies on Snellen acuity charts.
  • Limitations exist in current methods for fully evaluating visual function.

Purpose of the Study:

  • To review ophthalmic diagnostic systems.
  • To explore their potential beyond Snellen acuity.

Main Methods:

  • Review of advancements in ophthalmic diagnostics.
  • Focus on wavefront analysis, light scatter, and adaptive optics.

Main Results:

  • New technologies offer deeper understanding of optical principles.
  • These systems can assess visual potential and irregularities.
  • Comparative trials are needed for wider acceptance.

Conclusions:

  • Wavefront analysis, light scatter, and adaptive optics provide enhanced insight.
  • These modalities aid patient understanding of visual dysfunction.
  • Useful for medical and surgical decision-making.