I have only used this a few times and do not need it anymore. it is is great condition. I did not get prescription glasses inserted as I used my own glasses. eSight is effective for the large majority of people with low vision. Some remaining retinal function is required. A typical eSight wearer has visual acuity between 20/60 and 20/800, although some have visual acuity of 20/1400. The standard eSight 3 battery provides for up to three hours of continuous use. eSight 3 comes with two rechargeable, magnetic batteries that can be easily swapped in seconds for all-day use. Additional batteries can be purchased separately. eSight wearers see most things that normally sighted people see, such as: People’s faces, from up close and afar Newspapers, books, menus, signs, and other reading material, from any distance Computers and other work-related tools TV, movies, and other entertainment Concerts, plays and other live events eSight can autofocus on short, medium and long-range objects and includes features such as 24X zoom, image contrast enhancement, reverse colour display and more allowing users to go beyond the immediate enhanced vision provided and take control of what they see.