Drug delivery through soft contact lenses

Area of Science:

• Ophthalmology
• Pharmacology
• Drug Delivery Systems

Background:

• Cataract surgery requires effective perioperative antibiotic prophylaxis.
• Traditional subconjunctival antibiotic delivery has limitations in achieving sustained ocular drug levels.
• Novel drug delivery methods are needed to enhance antibiotic penetration into the aqueous humor.

Purpose of the Study:

• To compare the efficacy of soft contact lenses versus subconjunctival injections for delivering antibiotics.
• To determine the aqueous drug levels achieved by each delivery method.
• To evaluate the duration of therapeutic antibiotic levels against common ocular pathogens.

Main Methods:

• Clinical study involving 466 patients undergoing senile cataract surgery.
• Administration of chloromycetin, gentamicin, or carbenicillin via subconjunctival injection or soft contact lenses (New Sauflon 70/85).
• Biological estimation of aqueous drug levels at various time points post-administration.

Main Results:

• Soft contact lens delivery resulted in significantly higher aqueous antibiotic penetration compared to subconjunctival therapy.
• Both delivery methods achieved therapeutically effective drug concentrations.
• Therapeutic levels were maintained for intervals ranging from 2 to 12 hours, depending on the method and antibiotic used.

Conclusions:

• Soft contact lenses represent a superior method for enhancing antibiotic penetration for ocular infections.
• Both subconjunctival injections and contact lens delivery provide clinically relevant antibiotic coverage for cataract surgery.
• Further research can explore optimized contact lens-based antibiotic delivery systems for ophthalmic applications.