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Related Concept Videos

Photoreceptors and Visual Pathways01:22

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...
Anatomy of the Eyeball01:20

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,...
Visual System01:26

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 Vision01:15

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.
Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
Vision01:24

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: May 11, 2026

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
07:06

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

Visual acuity.

Steven H Schwartz1

  • 1Department of Biological and Vision Sciences, SUNY College of Optometry, New York, NY, United States.

Handbook of Clinical Neurology
|May 9, 2026
PubMed
Summary
This summary is machine-generated.

Visual acuity testing measures how well you see. Modern eye charts and methods improve reliability, but standard tests miss issues like reduced contrast sensitivity, especially in older adults.

Keywords:
Contrast sensitivityDepth of fieldHyperacuityMinimal detectable acuityMinimum angle of resolution (MAR)OptotypeRecognition acuityResolution acuity

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Visual acuity is a primary measure of visual function, susceptible to various optical and neurological factors.
  • Current visual acuity tests may lack reliability and validity due to chart design and testing protocols.
  • Age-related changes impact visual acuity, particularly contrast sensitivity, affecting daily activities like ambulation.

Purpose of the Study:

  • To evaluate the impact of chart design and psychophysical procedures on visual acuity measurement.
  • To highlight the limitations of standard visual acuity tests in assessing contrast sensitivity.
  • To explore advanced visual acuity measures for assessing macular function.

Main Methods:

  • Utilized modern eye charts based on Bailey-Lovie design principles.
  • Employed standardized psychophysical protocols for visual acuity determination.
  • Investigated standard and non-standard visual acuity measures, including hyperacuity thresholds.

Main Results:

  • Modern charts and protocols can minimize test-retest variability in visual acuity measurements.
  • Standard visual acuity tests do not adequately assess low-contrast stimuli resolution.
  • Hyperacuity threshold quantification shows potential for evaluating macular function.

Conclusions:

  • Optimized eye charts and protocols enhance the reliability of visual acuity testing.
  • Assessing contrast sensitivity is crucial, especially for the elderly population.
  • Advanced visual acuity assessments, like hyperacuity, offer valuable insights into visual processing and macular health.