| abstract |
PURPOSE: To obtain superior antibacterial property and oxygen permeability and to eliminate adverse influence upon a human body by adding antibacterial ceramic. n CONSTITUTION: Apatite ceramic is used in consideration of affinity with the human body, dispersion into a contact lens blank material polymer, kneading, and elution of antibacterial metal from the contact lens. Then an ion exchange method is used as a method which carries the antibacterial metal such as silver, copper, and zinc without dissolving the metal out. The ceramic in use is preferably particulate and when the powder is ≤5μm and the carrying amount of the metal is ≥0.0001%, sufficient antibacterial property is obtained. This ceramic is kneaded homogeneously with the contact lens blank material and mixed by an usual method for molding. Much addition exerts adverse influence upon the property of the contact lens such as transmissivity, plasticity, and elasticity, so the ceramic is added by several %. Consequently, a user wearing the contact lens feels no foreign matter while its transmissivity is not affected, and the antibacterial property can be displayed. n COPYRIGHT: (C)1992,JPO&Japio |