From what I learned while helping a relative research similar options, the program is usually designed for people with end-stage age-related macular degeneration who have already lost a lot of their central vision in both eyes but still have some usable peripheral vision. Doctors normally run several evaluations first, including vision tests and sometimes a trial with special lenses to see if magnification helps. The implant itself is placed in one eye to improve central detail while the other eye helps with side vision. When we were looking into it, we found a pretty clear explanation of the eligibility criteria and treatment steps on the Centrasight HGH official site. It helped us understand that not everyone is a candidate, but an eye specialist can determine that after a proper exam.