Related Experiment Video
Updated: Mar 13, 2026
Author Spotlight: In-Depth Morphometric Examination and Quantification of Native Lens Structure Using Whole Mount Imaging
Published on: January 19, 2024
Raman imaging of layered soft contact lenses
Katarzyna Krysztofiak1,2, Kamila Ciężar1,2, Mikołaj Kościński1,2
1Department of Physics, Adam Mickiewicz University, Poznań - Poland.
Background:
Daily disposable contact lenses are gaining in popularity among practitioners and wearers for the improved ocular health and subjective outcomes they offer. Recently a novel daily disposable contact lens material with water gradient technology was introduced. Delefilcon A lenses consist of a 33% water content silicone hydrogel core and an outer hydrogel layer which is totally free of silicone and contains 80% water.
Methods:
The aim of the present study was to confirm the layered structure of delefilcon A contact lenses. Thickness of hydrogel coating on the silicone hydrogel core was assessed using Raman spectroscopy. To investigate the layered structure of the material, depth spectra of the lenses were recorded.
Results:
The results obtained suggest that at about 6 μm a boundary between the hydrogel layer and silicone hydrogel core exists, which is in good agreement with the manufacturer's data.
Conclusions:
Data collected in this experiment confirm a water gradient at the delefilcon A lens surface.
More Related Videos
08:13In Vivo Confocal Microscopy in the Diagnosis and Management of Dry Eye: A Focus on Imaging Protocols and Interpretation
Published on: November 11, 2025
11:07Visualizing and Quantifying Pharmaceutical Compounds within Skin using Coherent Raman Scattering Imaging
Published on: November 24, 2021
