Current technological developments have undergone many very rapid changes, along with human needs that are increasingly numerous and complex . Computers that were originally only used by academics, are now widely used in various fields, such as business, health, education, games and so on. This encourages experts to further develop computer technology so that it can help human work or even exceed human work capabilities. An expert system is a system that seeks to adopt human knowledge into computers that are designed to represent the ability to solve problems like an expert. With this expert system, ordinary people can solve their problems or just look for quality information that can only be obtained with the help of experts in their fields. This research will be carried out using the forward chaining method , the Forward Chaining method is one of the two methods that are often used in making expert systems. By using the Forward Chaining method . obtained a value of similarity with previous cases of disorders experienced by cataract patients. This Expert System program is implemented in the PHP programming language with a Web-based MySQL database. As the final result, the conclusion is that this system is easy to use (user-friendly) and easy to develop and useful for those who want to know about cataracts
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