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Related Concept Videos

Accessory Structures of the Eye01:17

Accessory Structures of the Eye

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...
Muscles of the Eye01:20

Muscles of the Eye

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.
Extraocular Muscles
The six extraocular muscles surround the eyeball and control its movements. They are responsible for a wide range of eye motions, including looking up, down, left, right, and rotating...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
Somatic Spinal Reflexes01:22

Somatic Spinal Reflexes

Somatic spinal reflexes are rapid, involuntary muscular responses to external stimuli that involve the somatic musculature and the spinal cord.
One of the most well-known somatic spinal reflexes is the stretch reflex, which is activated by the sudden stretching of a muscle. This reflex involves the activation of specialized sensory receptors called muscle spindles, which are located in the muscle tissue and detect changes in the length and speed of muscle contractions. When a muscle is suddenly...
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.

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Related Experiment Video

Updated: Jun 24, 2026

Surgical Correction for Pediatric Epiblepharon and Trichiasis
03:59

Surgical Correction for Pediatric Epiblepharon and Trichiasis

Published on: July 8, 2025

Spontaneous consecutive exotropia in childhood.

Julie D Senior1, Arvind Chandna, Anna R O'Connor

  • 1Department of Paediatric Ophthalmology, Alder Hey Children's NHS Foundation Trust, Liverpoo, UK.

Strabismus
|March 21, 2009
PubMed
Summary

Spontaneous consecutive exotropia in children often presents with early-onset esotropia, high hypermetropia, and a lack of binocular vision. Amblyopia is not a significant characteristic in these cases.

Area of Science:

  • Ophthalmology
  • Strabismus Research
  • Pediatric Eye Care

Background:

  • Consecutive exotropia typically follows surgical correction of esotropia.
  • Spontaneous development of consecutive exotropia is less common but occurs.
  • Understanding its characteristics is crucial for diagnosis and management.

Purpose of the Study:

  • To investigate the clinical features of spontaneous consecutive exotropia.
  • To identify key patient characteristics associated with this condition.
  • To compare findings with existing literature on consecutive exotropia.

Main Methods:

  • Retrospective analysis of patient records from May 2000 to December 2003.
  • Inclusion criteria: patients with esotropia that spontaneously converted to exotropia without surgical or botulinum toxin A intervention.

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Using an Automated Hirschberg Test App to Evaluate Ocular Alignment
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Using an Automated Hirschberg Test App to Evaluate Ocular Alignment

Published on: March 24, 2020

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Last Updated: Jun 24, 2026

Surgical Correction for Pediatric Epiblepharon and Trichiasis
03:59

Surgical Correction for Pediatric Epiblepharon and Trichiasis

Published on: July 8, 2025

Using an Automated Hirschberg Test App to Evaluate Ocular Alignment
05:40

Using an Automated Hirschberg Test App to Evaluate Ocular Alignment

Published on: March 24, 2020

  • Study included 14 pediatric patients.

    • Main Results:

    • Esotropia onset occurred between early infancy and nearly 4 years of age.
    • Common findings included esotropia onset by 24 months, high hypermetropia (+5 DS mean spherical equivalent), and absence of binocular single vision.
    • No patients were on occlusion therapy, and dense amblyopia was absent at the onset of exotropia.

    Conclusions:

    • Spontaneous consecutive exotropia exhibits variable clinical presentations.
    • Early-onset esotropia, high hypermetropia, and lack of binocular vision are frequently observed.
    • Amblyopia was not identified as a significant factor in this cohort.