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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Glaucoma: Overview01:25

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...
Angle Closure Glaucoma: Treatment01:28

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...
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
Unrenewable Cells00:50

Unrenewable Cells

In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...
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...

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Related Experiment Video

Updated: Jun 20, 2026

Characterization of Molecular Mechanisms of In vivo UVR Induced Cataract
13:56

Characterization of Molecular Mechanisms of In vivo UVR Induced Cataract

Published on: November 28, 2012

Cataract blindness in the developing world: is there a solution?

Robert Isaacs1, Jagat Ram, David Apple

  • 1Department of Ophthalmology, Medical University of South Carolina, 171 Ashley Avenue, Charleston, SC 29425, USA.

Journal of Agromedicine
|September 30, 2009
PubMed
Summary

Cataract surgery backlog in developing nations is growing. Combining intracapsular cataract extraction with anterior chamber intraocular lens implantation offers a cost-effective solution for widespread sight rehabilitation.

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Modeling Cataract Surgery in Mice
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Modeling Cataract Surgery in Mice

Published on: December 1, 2023

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Last Updated: Jun 20, 2026

Characterization of Molecular Mechanisms of In vivo UVR Induced Cataract
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Characterization of Molecular Mechanisms of In vivo UVR Induced Cataract

Published on: November 28, 2012

Modeling Cataract Surgery in Mice
05:19

Modeling Cataract Surgery in Mice

Published on: December 1, 2023

Area of Science:

  • Ophthalmology
  • Global Health
  • Surgical Innovation

Background:

  • Cataracts are the primary cause of global blindness, disproportionately affecting developing countries.
  • Millions of new cataract blindness cases emerge annually, overwhelming existing treatment capacities.
  • Current surgical interventions in developing regions are often too costly or yield suboptimal outcomes, failing to address the escalating backlog.

Purpose of the Study:

  • To evaluate the efficacy of a combined intracapsular cataract extraction with anterior chamber intraocular lens implantation (ICCE AC-IOL) as a cost-effective solution.
  • To explore an alternative surgical approach for cataract treatment in resource-limited settings.
  • To identify methods for reducing the significant backlog of untreated cataracts in developing nations.

Main Methods:

  • Review of existing cataract surgery techniques used in developing countries.
  • Analysis of the potential benefits of combining intracapsular cataract extraction (ICCE) with anterior chamber intraocular lens (AC-IOL) implantation.
  • Comparison of ICCE AC-IOL with current standard procedures like extra capsular cataract extraction (ECCE) with posterior chamber intraocular lens (PC-IOL).

Main Results:

  • Extra capsular cataract extraction (ECCE) with posterior chamber intraocular lens (PC-IOL) is considered a preferred but not universally accessible method.
  • Intracapsular cataract extraction (ICCE) is currently the most common method in rural developing areas.
  • Combining ICCE with AC-IOL implantation presents a potentially cost-effective and efficacious approach to cataract surgery.

Conclusions:

  • The combination of ICCE with AC-IOL implantation may offer a viable strategy to reduce the substantial backlog of cataract blindness in developing countries.
  • This surgical approach could enhance sight rehabilitation efforts by providing an affordable and effective treatment option.
  • Further research and implementation are needed to assess the full impact of ICCE AC-IOL on global cataract burden.