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Intrasession Repeatability of the Contact Angle Measured Using the Captive Bubble Method and Agreement Assessed

Irene Sanchez1, Francisco Javier Carmona, Sara Gonzalez-Puertas

  • 1Departamento de Física Teórica, Atómica y Óptica (I.S., R.M.), Universidad de Valladolid, Valladolid, Spain; Instituto Universitario de Oftalmobiología Aplicada (IOBA) (I.S., R.M.), Universidad de Valladolid, Valladolid, Spain; Optometry Research Group (I.S., S.G.-P., A.V., R.M.), IOBA Eye Institute, School of Optometry, University of Valladolid, Valladolid, Spain; Dpto. de Física Aplicada (F.J.C.), Universidad de Extremadura, Escuela Politécnica, Cáceres, Spain; and School of Health Professions (R.M.), Plymouth University, Plymouth, United Kingdom.

Eye & Contact Lens
|August 31, 2019
PubMed
Summary

The captive bubble method demonstrates excellent repeatability for measuring contact angles in hydrogel and silicone hydrogel contact lenses. However, different software programs yield significantly different results, indicating a need for standardization in contact lens material analysis.

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Area of Science:

  • Ophthalmology and Vision Science
  • Biomaterials Science
  • Surface Chemistry

Background:

  • Contact lens (CL) material biocompatibility, particularly wettability, is crucial for wearer comfort and adherence.
  • Decreased wettability of hydrogel and silicone hydrogel (SiHy) contact lenses can lead to reduced comfort and increased wearer dropout.
  • Accurate measurement of contact angles is essential for assessing CL wettability and material performance.

Purpose of the Study:

  • To evaluate the repeatability and agreement of contact angle measurements using two software programs (FTÅ200 and ImageJ) with the captive bubble method.
  • To assess the reliability of contact angle measurements in marketed hydrogel and silicone hydrogel contact lenses.
  • To provide insights for clinical practice and standardization of contact angle measurement techniques.

Main Methods:

  • Contact angle measurements were performed on 23 different contact lenses using the captive bubble method.
  • Two software programs, FTÅ200 and ImageJ, were employed for analysis.
  • Three consecutive measurements were taken for each lens, with reproducibility, repeatability, and agreement calculated per international standards.

Main Results:

  • Both software programs exhibited high repeatability for contact angle measurements across CL materials (CV <1.51%, Sw <2.26°, ICC >0.89).
  • FTÅ200 software showed higher concordance between spherical and nonspherical measurements compared to ImageJ.
  • Statistically significant differences (P<0.05) in measured contact angles, ranging from 5° to 10°, were observed between the two software programs.

Conclusions:

  • The captive bubble method is highly repeatable for measuring contact angles in marketed contact lenses using both FTÅ200 and ImageJ software.
  • Despite good repeatability, the software programs are not interchangeable due to significant differences in measured angles.
  • Standardization of contact angle measurement methods for hydrogel CL materials is recommended to enhance comparability and clinical utility.