Analysis of water film thickness on contact lens by reflectometry technique

Michael R. Wang, Hui Lu, Jianhua Wang, Meixiao Shen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


We report the use of optical reflectometry technique for evaluation of water film on contact lens. The water film can be measured through the spectral dependent reflectance evaluation, which is carried out by illuminating the contact lens with a white light and collecting the returning light with an optical fiber coupled to a spectrometer. Water film thinning process has been observed on different soft contact lenses and minimum measurable thickness is about 0.85 μm. The measurement is fast and accurate. The water film measurement can be valuable for contact lens design to improve its hydrophilic properties. The technique can be extended for the study of tear film dynamics in an eye.

Original languageEnglish (US)
Title of host publicationOphthalmic Technologies XXI
StatePublished - Apr 1 2011
EventOphthalmic Technologies XXI - San Francisco, CA, United States
Duration: Jan 22 2011Jan 24 2011

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


OtherOphthalmic Technologies XXI
Country/TerritoryUnited States
CitySan Francisco, CA


  • Contact Lens
  • Hydrophilic
  • Reflectometry
  • Water Film

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Radiology Nuclear Medicine and imaging


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