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Related Experiment Videos

Pigment release

R Mapstone

    The British Journal of Ophthalmology
    |April 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Phenylephrine and pilocarpine eye drops can lower intraocular pressure. However, pigment release in the eye can block outflow, nullifying these effects and potentially causing glaucoma.

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    Area of Science:

    • Ophthalmology
    • Pharmacology

    Background:

    • Ocular hypertension and glaucoma management often involves topical autonomic drugs.
    • Paradoxical responses to these medications can occur, necessitating further investigation.

    Purpose of the Study:

    • To investigate the effect of phenylephrine and pilocarpine on intraocular pressure and outflow facility.
    • To determine the role of pigment release in modulating the effects of these autonomic drugs.

    Main Methods:

    • Administration of phenylephrine 10% and pilocarpine 2% eye drops to patients with ocular hypertension and glaucoma.
    • Observation of intraocular pressure and facility of outflow.
    • Assessment of pigment release into the aqueous humor.

    Main Results:

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    • Phenylephrine decreased intraocular pressure and increased outflow, but this was nullified by pigment release.
    • Pilocarpine reduced pressure and increased outflow; addition of phenylephrine caused paradoxical responses if pigment was released.
    • Pigment release in exfoliation glaucoma led to increased pressure and decreased outflow; acute pigment release causes outflow-blocking.

    Conclusions:

    • Acute pigment release significantly impairs aqueous outflow, explaining paradoxical responses to autonomic drugs.
    • Pigment dispersion syndrome can be sufficiently explained by the outflow-blocking effect of released pigment.
    • Understanding pigment dynamics is crucial for managing certain types of glaucoma.