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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...
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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,...
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.
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

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The Retina

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Related Experiment Video

Updated: May 12, 2026

Measuring the Behavioral Effects of Intraocular Scatter
05:10

Measuring the Behavioral Effects of Intraocular Scatter

Published on: February 18, 2021

Accommodation, pattern glare, and coloured overlays.

Peter M Allen1, Sonia Dedi, Dimple Kumar

  • 1Vision and Eye Research Unit, Postgraduate Medical Institute, Cambridge CB1 1PT, UK. peter.allen@anglia.ac.uk

Perception
|April 17, 2013
PubMed
Summary
This summary is machine-generated.

This study found that pattern glare symptoms are not strongly linked to the eye's focusing ability (accommodation). While colored overlays reduced accommodative lag in some participants, this did not correlate with pattern glare reduction.

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Area of Science:

  • Ophthalmology
  • Visual Science
  • Optometry

Background:

  • Pattern glare symptoms can affect visual performance and comfort.
  • Accommodation, the eye's ability to adjust focus, is crucial for clear vision.

Purpose of the Study:

  • To investigate the association between symptoms of pattern glare and the accommodative response in young adults.
  • To determine if manipulating accommodation with lenses and overlays influences pattern glare.

Main Methods:

  • Two groups of young adults were selected based on reading speed changes with an overlay and pattern glare symptoms.
  • Accommodation was measured using an open-field autorefractor under double-masked conditions with and without positive/negative lenses and a colored overlay.
  • Pattern glare was assessed with and without trial lenses.

Main Results:

  • A significant decrease in accommodative lag was observed with a colored overlay in the group experiencing increased reading speed (Group 1).
  • This effect on accommodative lag was not observed in the control group (Group 2).
  • Pattern glare scores were reduced by trial lenses in both groups, irrespective of lens sign, and were unaffected by the overlay.

Conclusions:

  • Symptoms of pattern glare do not appear to be strongly associated with the accommodative response.
  • Visual performance improvements with overlays may not be solely mediated by changes in accommodation.