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Related Experiment Videos

Sector pupil dilation with phenylephrine and tropicamide.

F W Chang, T A McCan, J R Hitchcock

    American Journal of Optometry and Physiological Optics
    |July 1, 1985
    PubMed
    Summary

    Phenylephrine eye drops caused greater vertical pupil dilation than horizontal, peaking at 40 minutes. Tropicamide eye drops caused equal pupil dilation in both directions, also peaking around 40 minutes.

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    Area of Science:

    • Ophthalmology
    • Pharmacology

    Background:

    • Pupil dilation is crucial for ophthalmic examinations.
    • Phenylephrine and tropicamide are commonly used mydriatic agents.
    • Understanding differential pupil dilation effects is important for clinical practice.

    Purpose of the Study:

    • To compare the sector pupil dilation effects of 2.5% phenylephrine and 1.0% tropicamide.
    • To assess the temporal changes in vertical and horizontal pupil diameters after drug instillation.

    Main Methods:

    • A comparative study involving nine subjects.
    • Measurement of vertical and horizontal pupil diameters at various time points post-instillation.
    • Administration of 2.5% phenylephrine in one eye and 1.0% tropicamide in the fellow eye.

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    Main Results:

    • 2.5% phenylephrine induced significantly greater vertical than horizontal pupil dilation, with maximum effect at 40 minutes.
    • 1.0% tropicamide produced symmetrical dilation in both vertical and horizontal meridians, maximal at 40 minutes.
    • Baseline pupil diameter was 3.7 mm; phenylephrine at 40 min resulted in 6.7 mm (vertical) and 5.2 mm (horizontal); tropicamide at 50 min resulted in 7.0 mm (both meridians).

    Conclusions:

    • Phenylephrine exhibits anisotropic pupil dilation, primarily affecting the vertical diameter.
    • Tropicamide demonstrates isotropic pupil dilation, affecting both meridians equally.
    • Both agents achieve maximum mydriasis around 40 minutes post-instillation.