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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...
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Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
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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...
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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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Related Experiment Video

Updated: Jun 27, 2026

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

Intermittent esotropia.

Wilfried de Decker1, Erika de Decker Dannheim, Ute Backheuer

  • 1University Kiel, Rendsburg, Germany. info@augenklinik-rd.de

Strabismus
|December 18, 2008
PubMed
Summary
This summary is machine-generated.

This study on strabismus surgery found that most patients achieved subnormal binocular vision, not a complete cure. Bi-medial rectus recessions were preferred for surgical intervention in these cases.

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Last Updated: Jun 27, 2026

Using an Automated Hirschberg Test App to Evaluate Ocular Alignment
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Area of Science:

  • Ophthalmology
  • Strabismus Surgery

Background:

  • Intermittent strabismus was observed in less than half of the patients (N=46).
  • Diplopia, reported by 5 patients, was not considered a reliable indicator for surgical intervention.

Purpose of the Study:

  • To evaluate surgical outcomes for patients with strabismus.
  • To determine the effectiveness of bi-medial rectus recessions.

Main Methods:

  • Surgical intervention using bi-medial rectus recessions was preferred for patients requiring significant surgical correction.
  • Patient outcomes were assessed post-surgery.

Main Results:

  • The primary outcome was "subnormal binocular vision" in the majority of patients.
  • Only four patients (less than 10%) achieved a complete cure, indistinguishable from unaffected individuals.
  • Subnormal binocular vision should not be misdiagnosed as microtropia.

Conclusions:

  • Bi-medial rectus recessions are a preferred surgical approach for strabismus requiring substantial correction.
  • Achieving a complete cure for strabismus is challenging, with subnormal binocular vision being a common outcome.