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Related Concept Videos

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...
Clinical Trials01:16

Clinical Trials

Clinical trials are prospective experimental studies conducted on humans to determine the safety and efficacy of treatments, drugs, diet methods, and medical devices. Using statistics in clinical trials enables researchers to derive reasonable and accurate conclusions from the collected data, allowing them to make wise decisions in uncertain situations. In medical research, statistical methods are crucial for preventing errors and bias.
There are four phases in a clinical trial. A phase one...
Clinical Trials: Overview01:11

Clinical Trials: Overview

Clinical development focuses on how the drug will interact with the human body and encompasses four key phases of clinical trials, each serving a specific purpose in assessing the safety and effectiveness of new drugs. These phases overlap and build upon one another. Phase I involves a small group of healthy volunteers (typically 20-80 individuals) or, in cases where significant toxicity is expected, patients with the targeted disease, such as cancer or AIDS. The volunteers are tested for...
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...
Study Designs in Epidemiology01:20

Study Designs in Epidemiology

Epidemiological study designs are fundamental tools for investigating the distribution, determinants, and control of health conditions in populations. They help researchers understand the relationships between exposures and outcomes, and they broadly fall into two categories: "observational" and "experimental" studies.
Observational studies are those where the researcher does not intervene but rather observes natural variations. They include cross-sectional, cohort, and case-control studies.

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Related Experiment Video

Updated: Jun 2, 2026

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
07:11

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential

Published on: May 25, 2020

Developing the clinical components of a complex intervention for a glaucoma screening trial: a mixed methods study.

, Jennifer M Burr, Marion K Campbell

    BMC Medical Research Methodology
    |April 23, 2011
    PubMed
    Summary

    Developing effective glaucoma screening is crucial for preventing blindness. This study identified feasible screening interventions for open-angle glaucoma trials, balancing cost-effectiveness and equity.

    Related Experiment Videos

    Last Updated: Jun 2, 2026

    Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
    07:11

    Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential

    Published on: May 25, 2020

    Area of Science:

    • Ophthalmology
    • Public Health
    • Health Services Research

    Background:

    • Glaucoma is a leading cause of preventable blindness globally.
    • Open-angle glaucoma is the most prevalent form.
    • No randomized controlled trials have assessed glaucoma screening's effectiveness in reducing sight loss.

    Purpose of the Study:

    • To develop clinical components for a feasible and acceptable open-angle glaucoma screening intervention trial in the UK.
    • To inform the design of future glaucoma screening interventions.

    Main Methods:

    • A mixed-methods approach based on the Medical Research Council (MRC) framework for complex interventions.
    • Qualitative semi-structured interviews with 46 UK eye-care providers, policymakers, and commissioners.
    • Quantitative economic modeling integrated with qualitative findings.

    Main Results:

    • Broad support for primary care-based glaucoma screening trials using trained technical assistants and optometry input.
    • Reduced 189 potential components to a two-test intervention (optic nerve photography or perimetry, with or without tonometry).
    • Screening the general population from age forty is optimal for practicality and equity, despite higher cost-effectiveness in targeting high-risk individuals.

    Conclusions:

    • Feasible interventions for open-angle glaucoma screening were identified from a service delivery perspective.
    • Integrating qualitative and quantitative methods highlighted trade-offs between cost-effectiveness, feasibility, and equity.
    • Future steps should incorporate service user perspectives into intervention development.