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Related Concept Videos

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...
Allergic Reactions02:06

Allergic Reactions

Overview
Drug Metabolism: Phase I Reactions01:17

Drug Metabolism: Phase I Reactions

A phase I reaction is a biochemical process that introduces a functionally reactive polar group to a substance. This transformation predominantly occurs in the liver, facilitated by the cytochrome P450 system of hemoproteins situated in the lipophilic endoplasmic reticulum of cells. The metabolite generated through this process can have varying polarities. If it is sufficiently polar, it can be easily excreted in the urine due to its water compatibility. However, if the metabolite is nonpolar,...
Allergic Drug Reactions01:27

Allergic Drug Reactions

Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing numerous...
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...
Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

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Related Experiment Video

Updated: Jul 2, 2026

Induction of Ocular Surface Inflammation and Collection of Involved Tissues
06:38

Induction of Ocular Surface Inflammation and Collection of Involved Tissues

Published on: August 4, 2022

Late-phase reaction in ocular allergy.

Soo Hyun Choi1, Leonard Bielory

  • 1UMDNJ, New Jersey Medical School, Newark, New Jersey, USA.

Current Opinion in Allergy and Clinical Immunology
|September 5, 2008
PubMed
Summary

Ocular late-phase reaction, common in allergic rhinitis, is present in 50-100% of ocular allergy patients. This finding impacts disease severity and progression to systemic atopic disorders.

Area of Science:

  • Ophthalmology
  • Allergology
  • Immunology

Background:

  • Late-phase reaction is a known phenomenon in allergic rhinitis and asthma.
  • Its presence and implications in ocular allergy have not been fully elucidated.

Purpose of the Study:

  • To investigate the existence and characteristics of late-phase reactions in ocular allergy.
  • To determine the clinical significance of ocular late-phase reactions.

Main Methods:

  • A literature search was conducted using PubMed.
  • 18 relevant articles from allergy and ophthalmology literature were identified and reviewed.

Main Results:

  • Ocular late-phase reaction is observed in 50-100% of allergic rhinoconjunctivitis patients.

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  • It is associated with disease progression to systemic atopic disorders.
  • Ocular late-phase reactions manifest in biphasic, multiphasic, and prolonged forms.
  • Conclusions:

    • Ocular late-phase reaction exists and plays a role in disease development, severity, and reactivity.
    • It signifies a continuum of mast-cell activation in the eye.
    • Understanding ocular late-phase reactions is crucial for developing targeted treatments for atopic eye disease.