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Related Concept Videos

Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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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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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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Focusing of Light in the Eye01:16

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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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Glaucoma: Overview01:25

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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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Accessory Structures of the Skin: Nails01:05

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Nails are one of the important accessory structures of the skin. They are hard, protective structures that cover the dorsal surface of the distal phalanges of fingers and toes. Nails are composed of specialized keratinized cells and serve various functions, including protection, sensation, and manual dexterity.
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Vision01:24

Vision

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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.
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Updated: Apr 5, 2026

A Simplified Technique for In situ Excision of Cornea and Evisceration of Retinal Tissue from Human Ocular Globe
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Overview of the Cornea: Structure, Function, and Development.

Allen O Eghrari1, S Amer Riazuddin1, John D Gottsch1

  • 1Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

Progress in Molecular Biology and Translational Science
|August 28, 2015
PubMed
Summary
This summary is machine-generated.

The cornea

Keywords:
CorneaCorneal developmentCorneal structureDescemet membraneEndotheliumEpitheliumStroma

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Area of Science:

  • Ophthalmology and Vision Science
  • Cell Biology
  • Developmental Biology

Background:

  • The cornea, a transparent ocular tissue, provides refractive and barrier functions.
  • Its epithelium acts as a primary barrier, supported by tight junctions and cell turnover.
  • The stroma and posterior layers (Descemet membrane, endothelium) maintain corneal clarity and hydration.

Purpose of the Study:

  • To elucidate the structural components and developmental origins of the cornea.
  • To describe the distinct functions of each corneal layer.

Main Methods:

  • Review of existing literature on corneal anatomy and embryology.
  • Analysis of cellular processes involved in corneal development and maintenance.

Main Results:

  • The epithelium's barrier function relies on tight junctions and basal cell layer regeneration.
  • The stroma provides structural support and immune functions.
  • The endothelium and Descemet membrane are crucial for maintaining corneal transparency and stromal dehydration.
  • Corneal development involves neural crest cell migration to form the stroma and endothelium.

Conclusions:

  • The cornea's structure is intricately designed for optical clarity and protection.
  • Understanding corneal development and layer-specific functions is vital for addressing vision disorders.