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Effect of phenylephrine on static and dynamic accommodation.

Antonio J Del Águila-Carrasco1, Francisco Lara2, Paula Bernal-Molina1

  • 1Department of Optics, and Optometry, and Vision Sciences. University of Valencia, 46100 Burjassot, Spain; Interuniversity laboratory for research in Vision and Optometry. Mixed group UVEG-UMU, Spain.

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|April 1, 2018
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Summary
This summary is machine-generated.

Phenylephrine Hydrochloride (PHCl) causes optical changes in the eye due to its mydriatic effect. These changes significantly impact accommodation measurements, affecting both static and dynamic responses.

Keywords:
AccommodationAcomodaciónFenilefrinaMetricsMétricaPhenylephrine

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Area of Science:

  • Ophthalmology
  • Optometry
  • Physiological Optics

Background:

  • Phenylephrine Hydrochloride (PHCl) is a medication used to dilate pupils.
  • Previous studies have suggested PHCl may alter accommodation, but the underlying mechanisms remain unclear.
  • Understanding these effects is crucial for accurate vision assessment.

Purpose of the Study:

  • To investigate whether optical changes induced by Phenylephrine Hydrochloride (PHCl) influence accommodation measurements.
  • To differentiate between the direct effects of PHCl on the ciliary muscle and its indirect optical effects.

Main Methods:

  • Two experiments assessed static and dynamic accommodation in human subjects before and after PHCl instillation.
  • Objective wavefront measurements quantified accommodative responses.
  • Analyses were performed considering mydriatic optical effects (higher-order aberrations) and excluding them (paraxial power changes).

Main Results:

  • When mydriatic optical effects were included, PHCl significantly altered static (0.51±0.53 D) and dynamic (0.12±0.15 D) accommodation measurements (p<0.039).
  • Excluding mydriatic optical effects, PHCl did not significantly change static (-0.20±0.51 D) or dynamic (-0.05±0.14 D) accommodation (p>0.313).

Conclusions:

  • The mydriatic effect of Phenylephrine Hydrochloride induces optical changes in the eye.
  • These optical changes can significantly reduce the accuracy of objective and subjective accommodation measurements.
  • It is essential to account for these optical effects when evaluating accommodation after PHCl use.