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Related Concept Videos

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

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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.
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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.
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...

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Related Experiment Video

Updated: Jun 7, 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

The association between objective visual quality, retinal structure, and dynamic visual acuity.

Ruoyu Li1,2, Zesong Wang1,2, Yuexin Wang3

  • 1Department of Ophthalmology, Peking University Third Hospital, No. 49 Huayuan North Road, Haidian District, Beijing, 100191, China.

BMC Ophthalmology
|June 5, 2026
PubMed
Summary
This summary is machine-generated.

Objective visual quality, measured by MTF, correlates with dynamic visual acuity (DVA) in myopic adults. Retinal structure showed limited association with DVA, suggesting visual quality is key for dynamic vision assessment.

Keywords:
Dynamic visual acuity (DVA)Higher-order aberration (HOA)Modulation transfer function (MTF)Optical coherence tomography angiography (OCTA)

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Last Updated: Jun 7, 2026

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
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Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
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Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients

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Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes
06:25

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Published on: February 23, 2024

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Dynamic visual acuity (DVA) is vital for assessing visual function in ophthalmology.
  • The influence of objective ocular parameters on DVA is not well understood, limiting test interpretation.
  • This study investigates how visual quality and retinal structure impact DVA.

Purpose of the Study:

  • To determine the relationship between objective visual quality (MTF, HOA) and DVA.
  • To explore the association between retinal structure (thickness, capillary density) and DVA.
  • To understand factors influencing dynamic visual performance in young myopic adults.

Main Methods:

  • Recruited healthy young myopic adults (18-35 years).
  • Measured binocular DVA at various velocities (20-80 dps) with habitual spectacles.
  • Assessed visual quality using Modulation Transfer Function (MTF) and higher-order aberrations (HOA), and retinal structure via OCTA.

Main Results:

  • DVA varied significantly with velocity (P < 0.001).
  • DVA correlated negatively with spherical refractive error at 20 and 60 dps.
  • Better MTF values were associated with improved DVA across different speeds; retinal parameters showed minimal association.

Conclusions:

  • Enhanced objective visual quality, indicated by MTF, may correlate with better DVA in myopic adults.
  • Retinal structural parameters demonstrated a limited association with DVA.
  • Habitual spectacle use during testing may confound results, limiting full optical quantification.