Evaluation of Rinsing Options for Rigid Gas Permeable Contact Lenses.

Area of Science:

• Ophthalmology
• Materials Science

Background:

• Rigid gas permeable (RGP) contact lenses require effective cleaning to maintain optical clarity and patient safety.
• Tap water is a common rinsing agent but carries risks of microbial contamination and inflammation.
• Alternative saline solutions are being explored to improve RGP lens hygiene.

Purpose of the Study:

• To evaluate the efficacy of different commercially available saline solutions in rinsing RGP lenses compared to tap water.
• To assess the relationship between fluid pressure of rinsing solutions and residual cleaner on the RGP lens surface.

Main Methods:

• Five commercial saline solutions and tap water were used to rinse RGP lenses after cleaning.
• Exiting fluid pressure was measured using a venous pressure transducer system.
• Lens surface deposits were quantified using high-resolution imaging and light transmission measurements (mean pixel count).

Main Results:

• A significant correlation was found between rinsing method, fluid pressure, and lens surface deposits (P <0.0001).
• Higher fluid pressure of rinsing solutions resulted in decreased lens surface deposits and residue.
• Tap water exhibited high exiting fluid pressure, leading to effective removal of RGP cleaners.

Conclusions:

• Fluid pressure is a key factor in the residue-clearing efficacy of rinsing solutions for RGP lenses.
• While tap water is effective, its use is contraindicated due to potential ocular health risks.
• Development of novel rinsing solutions and procedures is crucial for safe and effective RGP lens care.