A polymer-based technique to remove pollutants from soft contact lenses

Area of Science:

• Ophthalmology
• Materials Science
• Biomedical Engineering

Background:

• Soft contact lens wear is common, but surface contamination poses risks.
• Current cleaning methods like rinse and rub (RR) may not effectively remove all pollutants.
• Developing advanced cleaning techniques is crucial for contact lens hygiene and user safety.

Purpose of the Study:

• To introduce and evaluate a novel cleaning method for soft contact lenses called Polymer on Polymer Pollutant Removal (PoPPR).
• To compare the efficacy of PoPPR against the conventional RR method in removing various simulated pollutants.
• To explore the potential of PoPPR in improving contact lens safety and user experience.

Main Methods:

• The PoPPR method utilizes the elastic properties of polydimethylsiloxane (PDMS) for non-adhesive unpeeling of contaminants.
• Three PDMS ratios (1:30, 1:40, 1:50) were tested using PoPPR.
• Effectiveness was assessed against RR using pollen, microbeads, and nanoparticles as simulated pollutants.

Main Results:

• The optimal PDMS ratio for PoPPR was determined to be 1:40.
• PoPPR showed comparable efficacy to RR for larger particles like pollen (p > 0.05).
• PoPPR significantly outperformed RR in removing smaller particles, including microbeads (p = 0.006) and nanoparticles (p < 0.001).

Conclusions:

• The PoPPR method is a viable alternative to RR for cleaning soft contact lenses.
• PoPPR demonstrates superior effectiveness in removing fine particulate pollutants, such as microplastics and nanoparticles.
• This innovative technique could lead to enhanced safety, health, and comfort for contact lens wearers, particularly in polluted environments.