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Pilocarpine administration by contact lens.
Transactions of the Ophthalmological Societies of the United Kingdom
|April 1, 1977
Summary
Hydrophilic contact lenses deliver pilocarpine to the eye more effectively than drops or injections, achieving higher concentrations in the iris and ciliary body for better intraocular pressure control.
Area of Science:
- Ophthalmology
- Pharmacology
- Drug Delivery Systems
Background:
- Previous studies suggested hydrophilic contact lenses enhance pilocarpine delivery for intraocular pressure control.
- Optimizing pilocarpine delivery is crucial for managing glaucoma and related conditions.
Purpose of the Study:
- To compare the ocular distribution and concentration of pilocarpine delivered via hydrophilic contact lenses, eye drops, and subconjunctival injection in an animal model.
- To further elucidate the pharmacokinetic advantages of contact lens-mediated pilocarpine delivery.
Main Methods:
- Radioactive-labeled pilocarpine was used to quantify drug concentration in ocular tissues.
- Three administration methods were compared: hydrophilic contact lens, topical eye drops, and subconjunctival injection.
- Concentrations of pilocarpine in the iris, ciliary body, and conjunctiva were measured.
Main Results:
- Contact lens delivery resulted in significantly higher pilocarpine concentrations in the iris and ciliary body compared to drops and subconjunctival injection.
- Drop administration led to high pilocarpine concentration in the conjunctiva, comparable to subconjunctival injection.
- Subconjunctival injection showed comparable conjunctival concentrations to drops but lower iris/ciliary body concentrations than contact lenses.
Conclusions:
- Hydrophilic contact lenses offer a superior method for delivering pilocarpine to the anterior ocular tissues, specifically the iris and ciliary body.
- This enhanced delivery via contact lenses may translate to improved efficacy in managing intraocular pressure.
- Topical drop administration primarily increases conjunctival drug levels, with less efficient penetration to target ocular structures compared to contact lenses.