Book excerpt: Two well-respected eyecare specialists, Dr. Walter J. Zinn and Dr. Herbert Solomon, offer important tips and sound medical advice on how to prevent, treat or correct eye-related problems for the visually-dependent 1990s. Computers at work and home, video games, cable-TV, CD-ROM and all the high-tech equipment available today may produce a lot of fun and communicate plenty of information, but they create one negative side effect: eye strain. This book authoritatively offers the best defense, with timely suggestions on how to maintain better eyesight. Written in easy-to-understand language, you will learn of the latest treatments, surgeries and eyewear available.