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Photon correlation spectroscopy applied to tear analysis.

S Picarazzi1, M Lecchi2, V Pastori2

  • 1University of Milano Bicocca, Materials Science Department, Via R. Cozzi 55, I-20125 Milan, Italy.

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Summary
This summary is machine-generated.

Photon Correlation Spectroscopy (PCS) reveals significant differences in tear film properties between contact lens wearers and non-wearers. Contact lens wear alters tear component size and iron species interactions, impacting ocular surface health.

Keywords:
Contact lensElectron spin resonancePhoton correlation spectroscopyTear

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Area of Science:

  • Ophthalmology
  • Biophysics
  • Materials Science

Background:

  • Tear film stability is crucial for ocular surface health.
  • Contact lens wear can alter the physiological environment of the eye.
  • Understanding tear film changes is essential for managing contact lens-related complications.

Purpose of the Study:

  • To develop a protocol for analyzing human tear film properties using Photon Correlation Spectroscopy (PCS).
  • To compare tear film characteristics between contact lens wearers and non-wearers.
  • To investigate the influence of contact lens wear on tear component aggregation and structure using Electron Spin Resonance (ESR).

Main Methods:

  • Collected human tear samples (5μL) using a glass capillary.
  • Analyzed tear components' hydrodynamic diameter via PCS by measuring scattered light intensity fluctuations.
  • Investigated Fe3+ species in tears using Electron Spin Resonance (ESR) spectroscopy.

Main Results:

  • PCS demonstrated a statistically significant (p<0.001) increase in the mean hydrodynamic diameter of tear components in contact lens wearers compared to non-wearers.
  • These differences persisted even after contact lens removal.
  • ESR spectroscopy revealed distinct differences in Fe3+ species coordination and local environment between wearers and non-wearers, suggesting altered aggregation phenomena.

Conclusions:

  • PCS is a promising technique for assessing tear film features and the clinical effects of contact lens wear.
  • Contact lens wear induces changes in tear film composition and structure, potentially affecting ocular surface health.
  • ESR findings suggest that contact lens wear promotes aggregation of tear components involving iron species.