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Related Experiment Videos

Changes in computerized videokeratography induced by artificial tears

K D Novak1, T Kohnen, A Chang-Godinich

  • 1Cullen Eye Institute, Baylor College of Medicine, Department of Ophthalmology, Houston, Texas 77030, USA.

Journal of Cataract and Refractive Surgery
|November 14, 1997
PubMed
Summary
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Artificial tears can alter corneal measurements. For consistent computerized videokeratographic readings, avoid most artificial tears, opting for HypoTears or Tears Naturale II if needed.

Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Physiology

Background:

  • Accurate corneal measurements are crucial for diagnosing and managing various eye conditions.
  • Artificial tear preparations are commonly used by patients with dry eye disease.
  • The potential impact of artificial tears on diagnostic measurements requires careful consideration.

Purpose of the Study:

  • To investigate the effects of standard artificial tear solutions on computerized videokeratographic measurements.
  • To determine which artificial tear preparations cause minimal alterations in corneal topography.
  • To guide clinical practice regarding the use of artificial tears during serial topographic assessments.

Main Methods:

  • Evaluated 18 normal volunteers using the EyeSys Corneal Analysis System.

Related Experiment Videos

  • Obtained baseline and serial corneal topographic measurements after instilling various artificial tear preparations.
  • Analyzed changes in corneal curvature, keratometric-equivalent astigmatic power, and meridian.

    • Main Results:

    • Most artificial tears induced statistically significant, time-dependent changes in mean corneal power within the central 5 mm zone.
    • Induced changes in mean corneal power were generally less than or equal to 0.5 diopters.
    • Except for Celluvisc, artificial tears minimally affected corneal astigmatic power and meridian.

    Conclusions:

    • HypoTears and Tears Naturale II demonstrated the most consistency with baseline measurements.
    • Artificial tear use can introduce variability in serial corneal power measurements.
    • Clinicians should exercise caution when using artificial tears prior to serial videokeratographic assessments.