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Related Concept Videos

Accessory Structures of the Eye01:17

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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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The muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
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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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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...
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Related Experiment Video

Updated: Sep 6, 2025

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Binocular Function in Different Gaze Positions.

Amir Asharlous1, Asgar Doostdar1, Vahid Ghaemi2

  • 1Rehabilitation Research Center, Department of Optometry, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.

Journal of Ophthalmic & Vision Research
|June 29, 2022
PubMed
Summary

Binocular function, including convergence and accommodation, varies significantly across different gaze positions. Convergence showed more prominent changes than accommodation, which remained consistent in facility but varied in sufficiency.

Keywords:
Binocular VisionConvergenceFacilityGaze; PhoriaAccommodation

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Neuroscience

Background:

  • Binocular vision is crucial for depth perception and visual comfort.
  • Understanding how binocular functions adapt to different gaze directions is essential for diagnosing and managing visual disorders.

Purpose of the Study:

  • To investigate variations in key binocular functions across multiple gaze positions.
  • To assess amplitude of accommodation, near point of convergence, near phoria, and monocular accommodative facility in different gazes.

Main Methods:

  • A cross-sectional study involving 21 emmetropic participants aged 19-25 with 10/10 visual acuity.
  • Evaluated binocular functions in primary, upward, downward, left, and right gaze positions.

Main Results:

  • Near point of convergence showed significant differences across all gaze positions, with the highest values in left gaze.
  • Amplitude of accommodation varied significantly between upward, downward, and primary gazes.
  • Near phoria differed significantly between upward and primary gazes; monocular accommodative facility remained consistent across all gazes.

Conclusions:

  • Binocular functions, particularly convergence, exhibit notable variations depending on gaze direction.
  • Accommodative facility is consistent across gazes, while accommodative sufficiency shows variability.