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A combination solution for routine pupillary dilation.

David M Krumholz1, Joan K Portello, Mark Rosenfield

  • 1Department of Clinical Sciences, State University of New York, State College of Optometry, New York, New York 10036, USA. dkrumholz@sunyopt.edu

Optometry (St. Louis, Mo.)
|July 4, 2006
PubMed
Summary
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Reduced concentrations of tropicamide and phenylephrine eye drops effectively achieve adequate pupillary dilation for fundoscopy. This combination offers a viable alternative for routine eye examinations.

Area of Science:

  • Ophthalmology
  • Pharmacology

Background:

  • Routine fundoscopy requires adequate pupillary dilation.
  • Traditional mydriatic agents can cause side effects.
  • Investigating reduced concentrations of tropicamide and phenylephrine for improved tolerability.

Purpose of the Study:

  • To evaluate the efficacy of combination eye drops with reduced tropicamide and phenylephrine concentrations for pupillary dilation.
  • To compare the mydriatic effect of different reduced concentrations against a standard concentration.

Main Methods:

  • A randomized study involving 28 participants.
  • Pupillary dilation was induced using one drop of either 0.5% tropicamide/2.5% phenylephrine (control) or reduced concentrations (0.5% tropicamide/1.25% phenylephrine or 0.25% tropicamide/1.25% phenylephrine).

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  • Pupil diameter was measured via flash photography every 15 minutes for 3 hours post-instillation.

    • Main Results:

    • No significant difference in pupil diameter was observed between the 0.5% tropicamide/1.25% phenylephrine and the control group for the initial 75 minutes.
    • Maximum pupil diameter was achieved at 60 minutes, with no significant differences among the three tested solutions.
    • All tested solutions produced a pupil diameter of at least 7 mm within 30 minutes, maintained for at least 105 minutes.

    Conclusions:

    • Combination eye drops with reduced concentrations of tropicamide and phenylephrine are effective for achieving clinically adequate mydriasis.
    • These reduced-concentration formulations offer a potentially well-tolerated option for routine fundoscopy.