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Quantitative tear ferning. Methodologic and experimental investigations.

M Norn1

  • 1Eye Department, Hvidovre Hospital, University of Copenhagen, Denmark.

Acta Ophthalmologica
|April 1, 1988
PubMed
Summary
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Tear ferning methods vary significantly in reproducibility. Quantitative capillary tube aspiration of tear fluid offers the most reliable results for assessing tear film quality.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Clinical Diagnostics

Background:

  • Tear ferning is a diagnostic method used to assess tear film stability.
  • Previous studies have indicated variability in tear ferning test results.
  • Standardization of tear collection and analysis is crucial for reliable clinical application.

Purpose of the Study:

  • To evaluate the reproducibility of different tear-ferning methods.
  • To identify the most reliable method for quantitative tear ferning analysis.
  • To investigate factors affecting tear ferning.

Main Methods:

  • Double testing on 122 subjects using various tear collection and grading techniques.
  • Quantitative analysis of ferning area (mm²/µL) and coefficient of variation (CV).

Related Experiment Videos

  • Assessment of ferning under different conditions, including presence of obstructions and instilled substances.

    • Main Results:

    • Rough grading methods showed low reproducibility (42-50% recovery).
    • Quantitative methods using glass rods and pipettes exhibited high coefficients of variation (55-128%).
    • Capillary tube aspiration of standardized tear volumes (2.5 µL) yielded the lowest CV (6.4%), indicating high reproducibility.

    Conclusions:

    • Quantitative tear ferning using standardized capillary tube aspiration is the most reproducible method.
    • Ointments, emulsions, and mucous threads interfere with tear ferning.
    • Certain substances like methylcellulose and oils reduce ferning, while water and NH4OH stimulation do not significantly alter it.