Raman imaging of layered soft contact lenses.
J Appl Biomater Funct Mater
; 15(2): e149-e152, 2017 Apr 26.
Article
en En
| MEDLINE
| ID: mdl-27791229
ABSTRACT
BACKGROUND:
Daily disposable contact lenses are gaining in popularity among practitioners and wearers for the improved ocular health and subjective outcomes they offer. Recently a novel daily disposable contact lens material with water gradient technology was introduced. Delefilcon A lenses consist of a 33% water content silicone hydrogel core and an outer hydrogel layer which is totally free of silicone and contains 80% water.METHODS:
The aim of the present study was to confirm the layered structure of delefilcon A contact lenses. Thickness of hydrogel coating on the silicone hydrogel core was assessed using Raman spectroscopy. To investigate the layered structure of the material, depth spectra of the lenses were recorded.RESULTS:
The results obtained suggest that at about 6 µm a boundary between the hydrogel layer and silicone hydrogel core exists, which is in good agreement with the manufacturer's data.CONCLUSIONS:
Data collected in this experiment confirm a water gradient at the delefilcon A lens surface.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Lentes de Contacto Hidrofílicos
Idioma:
En
Revista:
J Appl Biomater Funct Mater
Año:
2017
Tipo del documento:
Article