PURPOSE: To develop a contact lens system that will control the release of an osmoprotectant and a moisturizing agent with the aim to reduce symptoms of ocular dryness. MATERIALS AND METHODS: Profiles of the release of osmoprotectant betaine and moisturizing agent dexpanthenol from senofilcon A and narafilcon B contact lenses were determined in vitro under sink conditions. Both types of lenses were also infused with vitamin E to increase the duration of drug release due to the formation of the vitamin E diffusion barriers in the lenses. The release profiles from vitamin E-infused lenses were compared with those from the control lenses. RESULTS: Both dexpanthenol and betaine are released from commercial silicone hydrogel lenses for only about 10 min. Vitamin E loadings into contact lenses at about 20-23% can increase the release times to about 10 h, which is about 60 times larger compared to the control unmodified lenses. CONCLUSIONS: Vitamin E-loaded silicone hydrogel contact lenses released betaine and dexpanthenol in a controlled fashion.
PURPOSE: To develop a contact lens system that will control the release of an osmoprotectant and a moisturizing agent with the aim to reduce symptoms of ocular dryness. MATERIALS AND METHODS: Profiles of the release of osmoprotectant betaine and moisturizing agent dexpanthenol from senofilcon A and narafilcon B contact lenses were determined in vitro under sink conditions. Both types of lenses were also infused with vitamin E to increase the duration of drug release due to the formation of the vitamin E diffusion barriers in the lenses. The release profiles from vitamin E-infused lenses were compared with those from the control lenses. RESULTS: Both dexpanthenol and betaine are released from commercial silicone hydrogel lenses for only about 10 min. Vitamin E loadings into contact lenses at about 20-23% can increase the release times to about 10 h, which is about 60 times larger compared to the control unmodified lenses. CONCLUSIONS:Vitamin E-loaded silicone hydrogel contact lenses released betaine and dexpanthenol in a controlled fashion.
Authors: Cesar Torres-Luna; Abdollah Koolivand; Xin Fan; Niti R Agrawal; Naiping Hu; Yuli Zhu; Roman Domszy; Robert M Briber; Nam Sun Wang; Arthur Yang Journal: Biomolecules Date: 2019-10-10