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Related Concept Videos

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.
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 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...
Parallel Processing01:20

Parallel Processing

The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...

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Related Experiment Video

Updated: Jul 7, 2026

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Exploring mandibular asymmetry: insights from visual perception using eye-tracking technology.

Eda Sarı1, Furkan Dindaroğlu2, Belkıs Durmuş3

  • 1Private Practice, Izmir, Turkey.

BMC Oral Health
|October 24, 2025
PubMed
Summary
This summary is machine-generated.

Mandibular asymmetry significantly impacts facial aesthetics. Increased asymmetry draws more attention to the chin and lower lip area, particularly for orthodontists, influencing visual perception.

Keywords:
Eye tracking technologyMandibular asymmetryVisual attention

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Area of Science:

  • Dental aesthetics
  • Oculomotor research
  • Facial asymmetry analysis

Background:

  • Facial asymmetry, particularly mandibular asymmetry, is a key factor in dental esthetic perception.
  • Visual attention research offers objective insights into how stimuli capture attention.

Purpose of the Study:

  • To investigate how varying degrees of mandibular asymmetry affect visual attention in orthodontists and non-professionals.
  • To utilize eye-tracking technology to objectively measure attention patterns.

Main Methods:

  • Eye movements of 26 orthodontists and 30 non-professionals were recorded using an Eyelink 1000 plus eye-tracking device.
  • Simulated mandibular asymmetries (2-8 mm deviation) were applied to 50 photographs, with asymmetry-free images serving as controls.
  • Repeated Measures Analysis of Variance (ANOVA) was employed for statistical analysis.

Main Results:

  • No significant difference in fixation counts towards the lower lip-chin area was observed based on asymmetry direction.
  • Time to first fixation on the lower lip-chin area was significantly faster in the 8 mm asymmetry condition compared to the 2 mm condition.
  • Orthodontists exhibited fewer fixations before reaching the lower lip-chin area in the 8 mm asymmetry condition versus the 2 mm condition.

Conclusions:

  • The direction of mandibular asymmetry does not influence voluntary visual attention.
  • Greater mandibular asymmetry increases attention directed towards the lower lip-chin area, irrespective of professional background.
  • An 8 mm asymmetry captured the involuntary attention of orthodontists, but not non-professionals.