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Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye
Published on: June 20, 2015
Computerized invasive measurement of time-dependent intraocular pressure
T V O Campos1, S Jacobovitz, H G Almeida
1Núcleo de Neurociências, Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
Summary
A new computerized system accurately measures dynamic intraocular pressure (IOP) changes, including ocular pulse waves. This device offers a reliable method for studying glaucoma pathogenesis and ocular pressure dynamics.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Physiology
Background:
- Accurate intraocular pressure (IOP) measurement is crucial for diagnosing and managing ocular conditions.
- Existing methods face limitations in measuring time-varying IOP, especially when corneal properties are altered.
- High-accuracy measurement of transient IOP variations and ocular pulse has remained a challenge.
Purpose of the Study:
- To introduce a novel computerized system for accurately recording time-varying intraocular pressure (IOP).
- To evaluate the system's sensitivity in measuring ocular pulse peak-to-peak values and kinetic IOP parameters.
- To assess the system's utility and sensitivity in research and clinical settings, particularly in altered corneal conditions.
Main Methods:
- Development of a computerized system comprising a pressure transducer, signal conditioning, and analog-to-digital conversion with video acquisition.
- Application of the system in rabbits (Oryctolagus cuniculus) following a modified Cairns trabeculectomy to assess IOP decay parameters.
- Analysis of kinetic parameters of IOP, including decay patterns and ocular pulse waves, and comparison of pre- and post-surgical recordings.
Main Results:
- The system reliably recorded transitory IOP variability and ocular pulse peak-to-peak values.
- The device effectively studied kinetic IOP parameters like decay patterns and pulse waves linked to cardiac and respiratory rhythms.
- A significant increase in the IOP versus time curve derivative was observed post-trabeculectomy, demonstrating system sensitivity.
Conclusions:
- The described computerized system provides a sensitive and reliable method for measuring dynamic intraocular pressure.
- This technology offers a valuable alternative for studying ocular pressure dynamics and investigating glaucoma pathogenesis.
- The method minimizes errors related to corneal thickness and operator variability, though it requires anesthesia for acute recordings.
