دانلود کتاب مواد، مواد شیمیایی، روش ها و کاربردهای لنزهای تماسی

This book focuses on the chemistry and properties of contact lenses and their fabrication methods. The text starts with a chapter in which a detailed history of contact lenses spanning over almost 500 years is presented Next, common materials that are used for the fabrication of contact lenses are listed and explained, including both the monomers and polymers that are used in their production. Special issues regarding soft lenses, clear contact lenses, and functional contact lenses are also discussed. Functional contact lenses can be used for remote health monitoring and ocular drug delivery systems. Besides the materials used here, these issues are detailed in further separate chapters. Also, special fabrication methods are discussed, e.g., the fabrication of multifocal contact lenses and the fabrication of ultrathin coatings. There is also an important discussion on additives that can be used, e.g., for oxygen-permeable materials or anti-biofouling materials. The chapter ends with a discussion of simulation methods for contact lenes, such asocular topography parameters, gas-permeable lenses, and computerized videokeratography. In the second chapter, several common fabrication methods for contact lenses are discussed. Here, computer-aided contact lens design, methods for the fabrication of colored contact lenses, and the fabrication of decentered contact lenses are detailed. Also, special processes are reviewed, including mold processes, reactive ion etching, electrospinning and others. Another chapter discusses the properties of contact lenses and methods of measurement. Here, a lot of standard methods are discussed. Besides standard methods, other issues are discussed such as the assessment of cytotoxic effects, the Schirmer tear test and others. A chapter is devoted to drug delivery of contact lenses, a comparatively new issue.