Rec. ITU-T F.922 (08/2020) Requirements of information service systems for visually impaired persons Summary History FOREWORD Table of Contents 1 Scope 2 References 3 Definitions 3.1 Terms defined elsewhere 3.2 Terms defined in this Recommendation 4 Abbreviations and acronyms 5 Conventions 6 System description 7 Service provision method 8 Service mode 9 Server function 9.1 User interaction 9.2 System management 9.3 Website management 10 Client function 10.1 Client for visually impaired persons 10.2 Client for volunteers 11 Service process procedure Bibliography