Related Experiment Videos
Examination of contact lens surfaces by Atomic Force Microscope (AFM)
S Bhatia1, E P Goldberg, J B Enns
1Department of Materials Science and Engineering, University of Florida, Gainesville 32611, USA.
Summary
Atomic Force Microscopy (AFM) effectively reveals surface changes in hydrated hydrogel contact lenses after wear. This advanced imaging technique offers high-resolution insights into lens surface morphology, crucial for developing better contact lens materials.
Area of Science:
- Ophthalmic biomaterials
- Surface science
- Microscopy techniques
Background:
- Hydrogel contact lenses are widely used for vision correction.
- Understanding surface changes during wear is critical for lens performance and patient comfort.
- Existing imaging methods can introduce artifacts due to dehydration or coating.
Purpose of the Study:
- To evaluate the efficacy of Atomic Force Microscopy (AFM) for examining hydrated hydrogel contact lens surfaces.
- To compare the surface morphology of unused versus worn contact lenses under natural, hydrated conditions.
Main Methods:
- Contact mode Atomic Force Microscopy (AFM) was employed.
- Several types of hydrogel contact lenses (Acuvue, Surevue, NewVues, CSI Clarity, SeeQuence) were examined in a fully hydrated state.
Main Results:
- AFM successfully visualized surface morphologies specific to each lens type and wear history.
- Worn lenses exhibited clear signs of abrasion and altered surface structure.
- Observed morphological changes varied based on the contact lens type, usage conditions, and location on the lens.
Conclusions:
- AFM is a powerful, high-resolution tool for analyzing hydrated contact lens surfaces without dehydration or coating artifacts.
- Significant differences in contact lens surface morphology were detected between new and used lenses.
- These findings can inform the development of novel contact lens polymers and ocular solutions.