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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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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
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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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Glaucoma: Overview

Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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The human eye has a specialized microbiota that reflects its unique anatomical and immunological environment. This low-biomass microbial community predominantly colonizes the conjunctiva and eyelid margins, playing a vital role in ocular surface homeostasis and defense. Despite its proximity to the richly colonized facial skin, the ocular surface maintains a distinct microbial profile due to continuous mechanical and biochemical defense mechanisms.The conjunctival surface hosts fewer microbial...

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Related Experiment Video

Updated: Jun 11, 2026

Surgical Correction for Pediatric Epiblepharon and Trichiasis
03:59

Surgical Correction for Pediatric Epiblepharon and Trichiasis

Published on: July 8, 2025

Eyelid entropion.

Mario Genilhu Bomfim Pereira1, Murilo Alves Rodrigues, Silvia Andrade Carvalho Rodrigues

  • 1Universidade Federal de Sao Paulo, Sao Paulo, Brazil.

Seminars in Ophthalmology
|July 2, 2010
PubMed
Summary

Entropion, an inward-turning eyelid, can lead to vision loss if untreated. This review details common surgical techniques for correcting entropion, particularly the prevalent involutional type.

Area of Science:

  • Ophthalmology
  • Oculoplastics
  • Surgical Techniques

Background:

  • Entropion is an eyelid malposition where the lid margin turns inward, potentially causing severe ocular complications.
  • Untreated entropion can lead to symptoms such as ocular discomfort, corneal abrasion, and visual loss.
  • Involutional entropion, the most common form, is increasingly prevalent due to an aging population.

Purpose of the Study:

  • To review and describe common surgical techniques for entropion correction.
  • To provide an overview of treatment strategies for this eyelid malposition.

Main Methods:

  • Review of established surgical procedures for entropion repair.
  • Description of techniques including everting sutures (Quickert), Weis procedure, orbicularis transfer, tarsal strip, and lower lid retractor advancement.

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Isolation of Intact Eyeball to Obtain Integral Ocular Surface Tissue for Histological Examination and Immunohistochemistry
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Isolation of Intact Eyeball to Obtain Integral Ocular Surface Tissue for Histological Examination and Immunohistochemistry

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Isolation of Intact Eyeball to Obtain Integral Ocular Surface Tissue for Histological Examination and Immunohistochemistry
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Main Results:

  • Multiple surgical options exist for entropion correction, catering to different types and severities.
  • Specific techniques like Quickert sutures, Weis procedure, and tarsal strip offer distinct approaches to lid margin eversion.

Conclusions:

  • Surgical intervention is crucial for managing entropion and preventing vision-threatening complications.
  • A range of surgical techniques are available, allowing for tailored treatment of entropion based on patient factors.