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Related Concept Videos

Microbiome of the Eye01:22

Microbiome of the Eye

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...
Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
Ophthalmic Drug Delivery Systems01:23

Ophthalmic Drug Delivery Systems

Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...
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...
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...
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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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Related Experiment Video

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Clinical Application of Intense Pulsed Light Therapy and Radio Frequency for Treatment of Ocular Surface Diseases
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Dry eye disease: pathophysiology, classification, and diagnosis.

Henry D Perry1

  • 1Lions Eye Bank for Long Island, North Shore University Hospital, Manhasset, NY, USA. hankcornea@aol.com

The American Journal of Managed Care
|May 9, 2008
PubMed
Summary

Dry eye disease (DED) is a complex eye condition affecting the tear film and ocular surface. This review covers DED

Area of Science:

  • Ophthalmology
  • Ocular Surface Disease

Background:

  • Dry eye disease (DED) is a prevalent, multifactorial condition impacting the tear film and ocular surface.
  • It leads to discomfort, visual disturbances, and potential ocular surface damage.
  • Current diagnostic criteria for DED lack uniformity, hindering consistent clinical management.

Purpose of the Study:

  • To comprehensively review the anatomy and physiology of the lacrimal functional unit and tear film.
  • To elucidate the pathophysiology, etiology, classification, and risk factors associated with DED.
  • To discuss current DED diagnostic approaches, including symptom assessment and diagnostic tests.

Main Methods:

  • Literature review of normal ocular surface anatomy and physiology.
  • Analysis of current research on DED pathophysiology and etiology.

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  • Synthesis of information on DED classification, risk factors, and diagnostic modalities.

    • Main Results:

    • Detailed description of the lacrimal functional unit and tear film dynamics.
    • Explanation of the multifactorial mechanisms underlying DED.
    • Overview of various diagnostic tests and their roles in DED assessment.

    Conclusions:

    • Understanding DED requires knowledge of its complex pathophysiology and contributing factors.
    • Standardized diagnostic criteria are needed for effective DED management.
    • This review provides a foundational understanding for diagnosing and managing dry eye disease.