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Related Experiment Videos

Changes in wavefront aberration with pharmaceutical dilating agents.

K Ashley Tuan1, Seema Somani, Dimitri A Chernyak

  • 1VISX Incorporated, Santa Clara, CA, USA. tuan_ashley@amo-inc.com

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|October 8, 2005
PubMed
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Pharmaceutical dilation can alter wavefront measurements and pupil position in refractive surgery patients. This study found pupil centers shifted randomly, affecting high-order aberration readings, especially with stronger dilating agents.

Area of Science:

  • Ophthalmology
  • Optometry
  • Refractive Surgery

Background:

  • Accurate wavefront measurements are crucial for refractive surgery, particularly for small pupils in an aging population.
  • Understanding the impact of pharmacological dilation on pupil dynamics and wavefront data is essential for reliable surgical planning.

Purpose of the Study:

  • To investigate the effect of pharmaceutical dilation on wavefront measurements and pupil centroid stability.
  • To determine if pupil dilation influences the accuracy of wavefront data used in refractive surgery.

Main Methods:

  • WaveScan Wavefront system used for baseline measurements on 32 eyes under dark-adapted conditions.
  • Pupils were pharmacologically dilated using tropicamide and phenylephrine, with wavefront data captured at intervals.

Related Experiment Videos

  • Wavefront analysis accounted for pupil diameter and center shifts, comparing pre- and post-dilation measurements.

    • Main Results:

    • Pharmacological dilation caused random shifts in pupil centroids in 45% of participants (> or = 0.2 mm).
    • Significant changes in total high-order aberrations (RMS) were observed in 18% of the population after dilation.
    • Less potent dilation (diluted tropicamide) resulted in smaller changes in high-order aberrations.

    Conclusions:

    • Pharmaceutical dilation agents can induce significant, random shifts in pupil centroid position.
    • These pupil shifts may lead to changes in wavefront measurements, impacting refractive surgery outcomes.
    • Caution is advised when using dilation for wavefront measurements in small pupils.