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Soft Contact Lens Engraving Characterization by Wavefront Holoscopy.

Rosa Vila-Andrés1, José J Esteve-Taboada1, Vicente Micó1

  • 1Department of Optics and Optometry and Vision Sciences, Faculty of Physics, Universitat de València, 46100 Burjassot, Spain.

Sensors (Basel, Switzerland)
|June 19, 2024
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Summary
This summary is machine-generated.

An inverted wavefront holoscope effectively characterizes permanent engravings on soft contact lenses. This lensless microscope provides detailed imaging crucial for user comfort and lens performance.

Keywords:
contact lensesdigital image processingdigital in-line holographyophthalmic instrumentationphase retrieval

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Area of Science:

  • Optics
  • Biomedical Engineering
  • Materials Science

Background:

  • Permanent engravings on contact lenses are vital for manufacturing and placement.
  • Assessing these marks is crucial for user comfort and preventing deposit adhesion.
  • Existing methods may lack the resolution or non-invasive nature required.

Purpose of the Study:

  • To explore an inverted wavefront holoscope for characterizing soft contact lens engravings.
  • To validate the holoscope's capability in imaging fine details on contact lenses.
  • To assess the instrument's potential for quality control in contact lens manufacturing.

Main Methods:

  • Utilized an inverted wavefront holoscope based on in-line digital holography.
  • Employed a partially coherent laser source to illuminate soft contact lenses in saline.
  • Reconstructed holograms using angular spectrum back propagation and phase-retrieval algorithms.

Main Results:

  • Experimentally validated the instrument's spatial resolution and thickness estimation.
  • Achieved successful reconstruction of phase maps for engravings on commercial soft contact lenses.
  • Demonstrated agreement between experimental results and theoretical expectations.

Conclusions:

  • The inverted wavefront holoscope is a promising tool for characterizing permanent contact lens marks.
  • This technique can aid in quality control and understanding lens surface topography.
  • Further optimization considering lens geometry is recommended to mitigate aberration effects.