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Related Concept Videos

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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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,...
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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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Angle Closure Glaucoma: Treatment01:28

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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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Open Angle Glaucoma: Treatment01:27

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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.
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Standard precautions are the minimum infection control safeguards used while caring for all patients, irrespective of their disease condition. They help prevent the spread of common infectious microorganisms to healthcare workers, patients, and visitors in all healthcare settings.
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Related Experiment Video

Updated: Jul 31, 2025

Author Spotlight: Enhancing Visual Outcomes in Cataract Surgery: A Novel Technique to Prevent Posterior Capsular Opacification Through IOL Rotation
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Cataracts: the essentials for patient care.

Penelope Stanford1

  • 1Senior Lecturer Adult Nursing, University of Manchester; Chair RCN Ophthalmic Nursing Forum.

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|May 2, 2023
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Summary

Cataracts affect over 2.2 billion people globally, causing visual impairment. This article reviews crystalline lens anatomy, physiology, and essential patient care amid pandemic-related surgical backlogs.

Keywords:
Cataractdistrict nursingpost-operative carepre-operative caresurgery

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Over 2.2 billion individuals worldwide experience visual impairment.
  • Cataracts, a leading cause of vision loss, are surgically treatable.
  • The COVID-19 pandemic has severely disrupted ophthalmic services, leading to estimated 5-year surgical waitlists.

Purpose of the Study:

  • To provide comprehensive information on the anatomy and physiology of the crystalline lens.
  • To outline essential patient care strategies for individuals with cataracts.
  • To address the challenges posed by extended wait times for cataract surgery.

Main Methods:

  • Review of anatomical and physiological principles of the crystalline lens.
  • Discussion of clinical considerations for patient management.
  • Analysis of the impact of service disruptions on patient outcomes.

Main Results:

  • Detailed explanation of normal crystalline lens structure and function.
  • Description of pathological changes associated with cataract formation.
  • Identification of key elements in effective cataract patient care.

Conclusions:

  • Understanding lens anatomy and physiology is crucial for managing cataracts.
  • Effective patient care strategies are essential, especially during periods of delayed surgical intervention.
  • Addressing the backlog in ophthalmic services is critical to mitigate the negative impact on patients with visual impairment.